Fix mainnet fork tests

[naddison36]

Changes

• The Mainnet fork tests now handle when the OETH withdrawal queue has a shortfall

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.36%. Comparing base (dfde2d8) to head (604513e). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2295 +/- ## ======================================= Coverage 53.36% 53.36% ======================================= Files 79 79 Lines 4098 4098 Branches 1079 1079 ======================================= Hits 2187 2187 Misses 1908 1908 Partials 3 3 ```

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