[Backport 2.11] Add 2.11.1.0 release notes

[opensearch-trigger-bot]

Backport abb41a9 from #1285

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (9a49f40) 76.70% compared to head (9a3d68a) 76.62%.
Report is 2 commits behind head on 2.11.

Files	Patch %	Lines
...cation/action/changes/TransportGetChangesAction.kt	30.76%	1 Missing and 8 partials ⚠️
...in/org/opensearch/replication/ReplicationPlugin.kt	50.00%	2 Missing and 1 partial ⚠️
.../org/opensearch/replication/util/ValidationUtil.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.11    #1287      +/-   ##
============================================
- Coverage     76.70%   76.62%   -0.08%     
- Complexity     1041     1045       +4     
============================================
  Files           141      141              
  Lines          4764     4778      +14     
  Branches        521      525       +4     
============================================
+ Hits           3654     3661       +7     
+ Misses          773      767       -6     
- Partials        337      350      +13     

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