[Backport 2.2] Add 2.2 release note

[opensearch-trigger-bot]

Backport 85b9bc4 from #450

[codecov-commenter]

Codecov Report

Merging #451 (85b9bc4) into 2.2 (4811922) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 85b9bc4 differs from pull request most recent head 6db4d1f. Consider uploading reports for the commit 6db4d1f to get more accurate results

@@             Coverage Diff              @@
##                2.2     #451      +/-   ##
============================================
- Coverage     75.96%   75.93%   -0.03%     
+ Complexity     2475     2471       -4     
============================================
  Files           314      314              
  Lines         14440    14440              
  Branches       2233     2233              
============================================
- Hits          10969    10965       -4     
- Misses         2224     2226       +2     
- Partials       1247     1249       +2     

Impacted Files	Coverage Δ
...earch/indexmanagement/transform/TransformRunner.kt	78.01% <0.00%> (-0.71%)	⬇️
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	68.71% <0.00%> (-0.59%)	⬇️
...earch/indexmanagement/transform/model/Transform.kt	85.47% <0.00%> (-0.43%)	⬇️
.../opensearch/indexmanagement/rollup/model/Rollup.kt	86.04% <0.00%> (ø)

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dco cant be fixed

[peterzhuamazon]

Close this as #452 already merged now.