[Backport 2.11] Add release notes for 2.11.1

[cwperks]

Manual backport of #3749 to 2.11

[codecov]

Codecov Report

Merging #3750 (5c073fc) into 2.11 (1d46ba6) will decrease coverage by 0.26%.
Report is 1 commits behind head on 2.11.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               2.11    #3750      +/-   ##
============================================
- Coverage     64.86%   64.61%   -0.26%     
+ Complexity     3613     3599      -14     
============================================
  Files           273      273              
  Lines         20024    20054      +30     
  Branches       3346     3348       +2     
============================================
- Hits          12989    12957      -32     
- Misses         5389     5448      +59     
- Partials       1646     1649       +3     

see 11 files with indirect coverage changes

[cwperks]

opensslCITest is running more than the openssl tests:

Tests with failures:
 - org.opensearch.security.auditlog.compliance.RestApiComplianceAuditlogTest.testAutoInit
 - org.opensearch.security.dlic.rest.api.InternalUsersApiActionValidationTest.validateSecurityRolesWithMutableRolesMappingConfig
 - org.opensearch.security.system_indices.SystemIndexDisabledTests.testUpdateAsNormalUser
 - org.opensearch.security.auditlog.compliance.RestApiComplianceAuditlogTest.testAutoInit

[cwperks]

I may have found the reason why the checks are running more tests than they should be on 2.11. I opened a Draft PR here to verify.

@peternied Since this is a release notes PR, can we merge this into 2.11 w/o all checks?