test: Solana's delta-based-ingress electoral System

[syan095]

Pull Request

Closes: PRO-1581

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

Added unit tests for the delta based ingress electoral system. Improved the mock system for the tests. Fixed a bug where on revert, on_finalize will cause underflow panic Log a warning on ingress reverts

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.18310% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (461e23e) to head (ff2e596). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...lectoral_systems/blockchain/delta_based_ingress.rs	0%	0 Missing and 1 partial :warning:
...cf-elections/src/electoral_systems/mocks/access.rs	98%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5445 +/- ## ===================================== - Coverage 72% 71% -0% ===================================== Files 494 494 Lines 87706 87627 -79 Branches 87706 87627 -79 ===================================== - Hits 62712 62652 -60 + Misses 22383 22364 -19 Partials 2611 2611 ```

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