[doc] Add linked references for message in old whatsnews

[Pierre-Sassoulas]

Type of Changes

	Type
✓	📜 Docs

Description

Manually taken from #10568 which still has some issues with detecting code inside doc. There's probably 404 in here as long as we don't implement #6670

[Pierre-Sassoulas]

Well there's a lot more work than I thought :

We also need to cleanup the msgid if it exists.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.94%. Comparing base (7be0b8f) to head (180ca46).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10638   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files         176      176           
  Lines       19519    19519           
=======================================
  Hits        18727    18727           
  Misses        792      792           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Pierre-Sassoulas]

There's a lot of old messages that were not detected because they are not in the message store anymore, so maybe no 404 contrary to what I said in the description.