txmgr: Include the revert reason in the error when estimateGas fails

[ajsutton]

Description

Include the revert reason in the error message when estimateGas fails in the tx mgr. Makes it much easier to understand why the transaction is failing to send.

e.g.:

t=2024-06-14T14:14:00+0000 lvl=warn msg="Failed to create a transaction, will retry" service=proposer err="failed to estimate gas: execution reverted, reason: 0xf40239db486a8f5cc1827b835ff127a4ba9a4c13ae70198dba5d66400c997f730853ae62"

The reason here is what comes back from the evm and can be decoded with cast 4byte-decode:

$ cast 4byte-decode 0xf40239db486a8f5cc1827b835ff127a4ba9a4c13ae70198dba5d66400c997f730853ae62
1) "UnexpectedRootClaim(bytes32)"
0x486a8f5cc1827b835ff127a4ba9a4c13ae70198dba5d66400c997f730853ae62

Tests

Added unit tests, confirmed with manual testing.