[Backport 8.x] Add library to check and notify release notes based on old workflow

[opensearch-trigger-bot]

Backport 7ebe7d2 from #626.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.15%. Comparing base (e50e00b) to head (e4f4845).
Report is 1 commits behind head on 8.x.

Files with missing lines	Patch %	Lines
src/jenkins/ReleaseMetricsData.groovy	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                8.x     #634      +/-   ##
============================================
+ Coverage     88.86%   89.15%   +0.28%     
- Complexity      109      111       +2     
============================================
  Files           115      116       +1     
  Lines           530      544      +14     
  Branches         30       30              
============================================
+ Hits            471      485      +14     
  Misses           29       29              
  Partials         30       30              

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