Add library to check and notify release notes based on old workflow

[gaiksaya]

Description

The python release workflow in build-repo generates a markdown table in the format: opensearch-project/opensearch-build#3747 (comment)
This change adds below things:

• Adds a class to parse the markdown file and return each component with respective values mapped to the keys.
• Adds a new library that will check or notify the release owners about the missing release notes.

Issues Resolved

opensearch-project/opensearch-build#5332

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[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 (5901476) to head (35ee84c).
Report is 3 commits behind head on main.

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

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #626      +/-   ##
============================================
+ 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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[zelinh]

Thanks @gaiksaya, could you look into the CodeCov failing here?

[gaiksaya]

Thanks @gaiksaya, could you look into the CodeCov failing here?

Added a test for exception as well.