[repo] Stable version update automation tweaks

[CodeBlanch]

Changes

• Switch references using OTelLatestStableVer to constrain allowed versions to 1.9.0 <= x < 2.0.0
• Update automation workflow to add CHANGELOG entries when OTelLatestStableVer is changed

Details

Test PR: CodeBlanchOrg#51

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.14%. Comparing base (6250307) to head (c81104a).
Report is 263 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5698      +/-   ##
==========================================
+ Coverage   83.38%   86.14%   +2.76%     
==========================================
  Files         297      254      -43     
  Lines       12531    11054    -1477     
==========================================
- Hits        10449     9523     -926     
+ Misses       2082     1531     -551     

Flag	Coverage Δ
unittests	?
unittests-Project-Experimental	86.06% <ø> (?)
unittests-Project-Stable	85.80% <ø> (?)
unittests-Solution	85.75% <ø> (?)
unittests-UnstableCoreLibraries-Experimental	84.44% <ø> (?)

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see 125 files with indirect coverage changes