ci: Fix flaky test `invalid server state: initialized`

[dplewis]

Pull Request

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• Link this pull request to an issue.

Issue

Attempt to fix flaky tests when the server isn't properly initialized. I believe this is caused by tests that shuts down the server to reproduce a disconnection and restarts. I am unable to reproduce this issue local so the CI should be ran a few times to ensure it works.

Closes: https://github.com/parse-community/parse-server/issues/9149

Approach

• Properly handle server shutdown
• Refactor helper.js
• Add retry strategy if server isn't properly initialized

[parse-github-assistant[bot]]

Thanks for opening this pull request!

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (b50790a) to head (2b03abd). Report is 83 commits behind head on alpha.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## alpha #2183 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 61 64 +3 Lines 6186 6365 +179 Branches 1499 1534 +35 ========================================== + Hits 6186 6365 +179 ```

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[parseplatformorg]

🎉 This change has been released in version 5.2.0-alpha.4

[parseplatformorg]

🎉 This change has been released in version 5.2.0-beta.2

[parseplatformorg]

🎉 This change has been released in version 5.2.0