chore: tidy solana vault swap test hooks

[kylezs]

Pull Request

Checklist

Please conduct a thorough self-review before opening the PR.

• [x] I am confident that the code works.
• [x] I have written sufficient tests.
• [x] I have written and tested required migrations.
• [x] I have updated documentation where appropriate.

Summary

Uses new ability introduced in #5441 for the solana vault swap elections tests.

[codecov[bot]]

Codecov Report

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

Project coverage is 71%. Comparing base (f007d1c) to head (0acb8df). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5452 +/- ## ====================================== - Coverage 71% 71% -0% ====================================== Files 494 494 Lines 87659 87535 -124 Branches 87659 87535 -124 ====================================== - Hits 62670 62492 -178 - Misses 22379 22432 +53 - Partials 2610 2611 +1 ```

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