[Backport 2.1] 2.1 release notes

[opensearch-trigger-bot]

Backport 47bbb32 from #387

[codecov-commenter]

Codecov Report

Merging #388 (47bbb32) into 2.1 (d70d507) will decrease coverage by 0.15%.
The diff coverage is n/a.

❗ Current head 47bbb32 differs from pull request most recent head fbee60e. Consider uploading reports for the commit fbee60e to get more accurate results

@@             Coverage Diff              @@
##                2.1     #388      +/-   ##
============================================
- Coverage     74.42%   74.27%   -0.16%     
  Complexity      383      383              
============================================
  Files            94       94              
  Lines          3984     3984              
  Branches        641      641              
============================================
- Hits           2965     2959       -6     
- Misses          885      891       +6     
  Partials        134      134              

Flag	Coverage Δ
dashboards-reports	76.85% <ø> (-0.32%)	⬇️
reports-scheduler	71.85% <ø> (ø)

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Impacted Files	Coverage Δ
dashboards-reports/public/components/main/main.tsx	56.73% <0.00%> (-5.77%)	⬇️

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