Refactor KMS E2E tests

[cmurphy]

• Move KMS tests from shell script to Go test suite
• Make KMS E2E tests hermetic
• Move KMS E2E workflow into main e2e-tests file

  Release Note

  Documentation

[codecov[bot]]

Codecov Report

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

Project coverage is 40.60%. Comparing base (2ef6022) to head (da9c49a). Report is 97 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3684 +/- ## ========================================== + Coverage 40.10% 40.60% +0.49% ========================================== Files 155 157 +2 Lines 10044 10157 +113 ========================================== + Hits 4028 4124 +96 - Misses 5530 5535 +5 - Partials 486 498 +12 ```

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[cpanato]

late lgtm