Various reward-related flaky tests

[Anviking]

Context

#2449 recently changed core logic in the network layer.

Very rarely, this failure appeared on the branch:

  src/Test/Integration/Framework/DSL.hs:1796:7:
  2) API Specifications, SHELLEY_STAKE_POOLS, STAKE_POOLS_JOIN_01rewards - Can join a pool, earn rewards and collect them
       expected a successful response but got an error: DecodeFailure "{\"code\":\"created_invalid_transaction\",\"message\":\"That's embarrassing. It looks like I've created an invalid transaction that could not be parsed by the node. Here's an error message that may help with debugging: HardForkApplyTxErrFromEra S (S (S (Z (WrapApplyTxErr {unwrapApplyTxErr = ApplyTxError [LedgerFailure (DelegsFailure (WithdrawalsNotInRewardsDELEGS (fromList [(RewardAcnt {getRwdNetwork = Mainnet, getRwdCred = KeyHashObj (KeyHash \\\"56e36e911d28670c50eaf7169e507bc1422162d3eb8a3c9982e2f95d\\\")},Coin 19675454185)])))]}))))\"}"
       While verifying (Status {statusCode = 500, statusMessage = "Internal Server Error"},Left (DecodeFailure "{\"code\":\"created_invalid_transaction\",\"message\":\"That's embarrassing. It looks like I've created an invalid transaction that could not be parsed by the node. Here's an error message that may help with debugging: HardForkApplyTxErrFromEra S (S (S (Z (WrapApplyTxErr {unwrapApplyTxErr = ApplyTxError [LedgerFailure (DelegsFailure (WithdrawalsNotInRewardsDELEGS (fromList [(RewardAcnt {getRwdNetwork = Mainnet, getRwdCred = KeyHashObj (KeyHash \\\"56e36e911d28670c50eaf7169e507bc1422162d3eb8a3c9982e2f95d\\\")},Coin 19675454185)])))]}))))\"}"))

  To rerun use: --match "/API Specifications/SHELLEY_STAKE_POOLS/STAKE_POOLS_JOIN_01rewards - Can join a pool, earn rewards and collect them/"

though I have also seen it once before.

After merging it, there seem to be an uptick in failures related to withdrawals.

Need to investigate, but might be that the reward balance is less consistently updated when the wallet is under high load (as in integration tests), since #2449.

Test Case

Multiple, related to withdrawals.

Failure / Counter-example

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Resolution

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QA

[Anviking]

Hoping this is fixed by #2698. Can re-open if not.

[jonathanknowles]

Saw a similar failure on this build:
https://buildkite.com/cardano-foundation/cardano-wallet/builds/827#018a695b-5e98-4c2c-b79c-824cb7fac8a6/6-708