[Backport 2.2] Added 2.2 release notes.

[opensearch-trigger-bot]

Backport dd48aae from #514

[codecov-commenter]

Codecov Report

Merging #515 (7b8405b) into 2.2 (a66229d) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.2     #515      +/-   ##
============================================
- Coverage     76.78%   76.73%   -0.05%     
  Complexity      176      176              
============================================
  Files           166      166              
  Lines          8370     8370              
  Branches       1232     1232              
============================================
- Hits           6427     6423       -4     
- Misses         1340     1343       +3     
- Partials        603      604       +1     

Impacted Files	Coverage Δ
...nationmigration/DestinationMigrationCoordinator.kt	63.82% <0.00%> (-4.26%)	⬇️
...ing/model/destination/DestinationContextFactory.kt	75.00% <0.00%> (-3.58%)	⬇️
...rch/alerting/opensearchapi/OpenSearchExtensions.kt	54.05% <0.00%> (-1.36%)	⬇️
...destinationmigration/DestinationConversionUtils.kt	70.00% <0.00%> (ø)

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