fix(slashing): fix upgrade script phase 4

[jbrower95]

• Adds a harness script start.sh for invoking the go binary. (must be executable).
• Expresses the arguments of the script -- a beacon node, an RPC node, and a privateKey.

Will be running this upgrade on a tenderly fork, through the script phase, to test this rollout. (For the final phase, we'll just provide a beacon holesky ETH2 node against the tenderly fork).

[github-actions]

Reading tracefile ./lcov.info.pruned
                                        |Lines       |Functions  |Branches    
Filename                                  |Rate     Num|Rate    Num|Rate     Num
================================================================================
[src/contracts/]
core/AVSDirectory.sol                     | 100%     23| 100%     7|    -      0
core/AllocationManager.sol                | 100%    291| 100%    41|    -      0
core/DelegationManager.sol                |96.4%    275|95.5%    44|    -      0
core/RewardsCoordinator.sol               |95.9%    218|92.9%    42|    -      0
core/StrategyManager.sol                  |96.7%     91|91.3%    23|    -      0
libraries/BeaconChainProofs.sol           | 100%     33| 100%    11|    -      0
libraries/BytesLib.sol                    | 0.0%    170| 0.0%    14|    -      0
libraries/Endian.sol                      | 100%      3| 100%     1|    -      0
libraries/Merkle.sol                      | 100%     43| 100%     5|    -      0
libraries/OperatorSetLib.sol              | 100%      4| 100%     2|    -      0
libraries/SlashingLib.sol                 |93.3%     30|90.9%    11|    -      0
libraries/Snapshots.sol                   |90.5%     42|88.9%     9|    -      0
mixins/PermissionControllerMixin.sol      | 100%      6| 100%     3|    -      0
mixins/SignatureUtils.sol                 | 100%     12| 100%     5|    -      0
permissions/Pausable.sol                  |93.3%     30|90.0%    10|    -      0
permissions/PauserRegistry.sol            | 100%     18| 100%     6|    -      0
permissions/PermissionController.sol      | 100%     73| 100%    17|    -      0
pods/EigenPod.sol                         |99.4%    155|96.3%    27|    -      0
pods/EigenPodManager.sol                  |99.0%     97|94.1%    17|    -      0
strategies/EigenStrategy.sol              | 0.0%     14| 0.0%     4|    -      0
strategies/StrategyBase.sol               |87.3%     63|78.9%    19|    -      0
strategies/StrategyBaseTVLLimits.sol      | 100%     17| 100%     5|    -      0
strategies/StrategyFactory.sol            | 100%     40| 100%     8|    -      0
token/BackingEigen.sol                    |79.1%     43|69.2%    13|    -      0
token/Eigen.sol                           |49.1%     53|61.5%    13|    -      0
================================================================================
                                  Total:|85.9%   1844|88.0%   357|    -      0

[github-actions]

Reading tracefile ./lcov.info.pruned
                                        |Lines       |Functions  |Branches    
Filename                                  |Rate     Num|Rate    Num|Rate     Num
================================================================================
[src/contracts/]
core/AVSDirectory.sol                     | 100%     23| 100%     7|    -      0
core/AllocationManager.sol                | 100%    291| 100%    41|    -      0
core/DelegationManager.sol                |96.4%    275|95.5%    44|    -      0
core/RewardsCoordinator.sol               |95.9%    218|92.9%    42|    -      0
core/StrategyManager.sol                  |96.7%     91|91.3%    23|    -      0
libraries/BeaconChainProofs.sol           | 100%     33| 100%    11|    -      0
libraries/BytesLib.sol                    | 0.0%    170| 0.0%    14|    -      0
libraries/Endian.sol                      | 100%      3| 100%     1|    -      0
libraries/Merkle.sol                      | 100%     43| 100%     5|    -      0
libraries/OperatorSetLib.sol              | 100%      4| 100%     2|    -      0
libraries/SlashingLib.sol                 |93.3%     30|90.9%    11|    -      0
libraries/Snapshots.sol                   |90.5%     42|88.9%     9|    -      0
mixins/PermissionControllerMixin.sol      | 100%      6| 100%     3|    -      0
mixins/SignatureUtils.sol                 | 100%     12| 100%     5|    -      0
permissions/Pausable.sol                  |93.3%     30|90.0%    10|    -      0
permissions/PauserRegistry.sol            | 100%     18| 100%     6|    -      0
permissions/PermissionController.sol      | 100%     73| 100%    17|    -      0
pods/EigenPod.sol                         |99.4%    155|96.3%    27|    -      0
pods/EigenPodManager.sol                  |99.0%     97|94.1%    17|    -      0
strategies/EigenStrategy.sol              | 0.0%     14| 0.0%     4|    -      0
strategies/StrategyBase.sol               |87.3%     63|78.9%    19|    -      0
strategies/StrategyBaseTVLLimits.sol      | 100%     17| 100%     5|    -      0
strategies/StrategyFactory.sol            | 100%     40| 100%     8|    -      0
token/BackingEigen.sol                    |79.1%     43|69.2%    13|    -      0
token/Eigen.sol                           |49.1%     53|61.5%    13|    -      0
================================================================================
                                  Total:|85.9%   1844|88.0%   357|    -      0

[github-actions]

Reading tracefile ./lcov.info.pruned
                                        |Lines       |Functions  |Branches    
Filename                                  |Rate     Num|Rate    Num|Rate     Num
================================================================================
[src/contracts/]
core/AVSDirectory.sol                     | 100%     23| 100%     7|    -      0
core/AllocationManager.sol                | 100%    291| 100%    41|    -      0
core/DelegationManager.sol                |96.4%    275|95.5%    44|    -      0
core/RewardsCoordinator.sol               |95.9%    218|92.9%    42|    -      0
core/StrategyManager.sol                  |96.7%     91|91.3%    23|    -      0
libraries/BeaconChainProofs.sol           | 100%     33| 100%    11|    -      0
libraries/BytesLib.sol                    | 0.0%    170| 0.0%    14|    -      0
libraries/Endian.sol                      | 100%      3| 100%     1|    -      0
libraries/Merkle.sol                      | 100%     43| 100%     5|    -      0
libraries/OperatorSetLib.sol              | 100%      4| 100%     2|    -      0
libraries/SlashingLib.sol                 |93.3%     30|90.9%    11|    -      0
libraries/Snapshots.sol                   |90.5%     42|88.9%     9|    -      0
mixins/PermissionControllerMixin.sol      | 100%      6| 100%     3|    -      0
mixins/SignatureUtils.sol                 | 100%     12| 100%     5|    -      0
permissions/Pausable.sol                  |93.3%     30|90.0%    10|    -      0
permissions/PauserRegistry.sol            | 100%     18| 100%     6|    -      0
permissions/PermissionController.sol      | 100%     73| 100%    17|    -      0
pods/EigenPod.sol                         |99.4%    155|96.3%    27|    -      0
pods/EigenPodManager.sol                  |99.0%     97|94.1%    17|    -      0
strategies/EigenStrategy.sol              | 0.0%     14| 0.0%     4|    -      0
strategies/StrategyBase.sol               |87.3%     63|78.9%    19|    -      0
strategies/StrategyBaseTVLLimits.sol      | 100%     17| 100%     5|    -      0
strategies/StrategyFactory.sol            | 100%     40| 100%     8|    -      0
token/BackingEigen.sol                    |79.1%     43|69.2%    13|    -      0
token/Eigen.sol                           |49.1%     53|61.5%    13|    -      0
================================================================================
                                  Total:|85.9%   1844|88.0%   357|    -      0