[release-20.0-rc] Release of v20.0.0-RC2

[shlomi-noach]

Includes the release notes and release commit for the v20.0.0-RC2 release. Once this PR is merged, we will be able to tag v20.0.0-RC2 on the merge commit.

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

• Apply the release notes (needs details) label if users need to know about this change.
• New features should be documented.
• There should be some code comments as to why things are implemented the way they are.
• There should be a comment at the top of each new or modified test to explain what the test does.

New flags

• Is this flag really necessary?
• Flag names must be clear and intuitive, use dashes (-), and have a clear help text.

If a workflow is added or modified:

• Each item in Jobs should be named in order to mark it as required.
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Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.51%. Comparing base (9104739) to head (c0e07de).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release-20.0-rc   #16225      +/-   ##
===================================================
- Coverage            68.54%   68.51%   -0.03%     
===================================================
  Files                 1541     1541              
  Lines               197788   197788              
===================================================
- Hits                135567   135516      -51     
- Misses               62221    62272      +51     

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[frouioui]

There are duplication in this file for instance on line 43 and 44. This is an issue with how we handle milestones. We should fix the changelog during the GA release.