[Backport] [1.x] add rc1 release notes to GA release

[ylwu-amzn]

Signed-off-by: Yaliang Wu ylwu@dev-dsk-ylwu-2c-e500d1cf.us-west-2.amazon.com

Description

Backport #116 to 1.x branch.

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #118 (510dee9) into 1.x (1896ce1) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                1.x     #118      +/-   ##
============================================
- Coverage     79.50%   79.32%   -0.19%     
+ Complexity     2699     2691       -8     
============================================
  Files           243      243              
  Lines         11132    11132              
  Branches       1014     1014              
============================================
- Hits           8851     8830      -21     
- Misses         1869     1887      +18     
- Partials        412      415       +3     

Flag	Coverage Δ
plugin	79.32% <ø> (-0.19%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../main/java/org/opensearch/ad/cluster/HashRing.java	78.94% <0.00%> (-5.27%)	⬇️
...port/SearchAnomalyDetectorInfoTransportAction.java	63.63% <0.00%> (-4.55%)	⬇️
src/main/java/org/opensearch/ad/model/ADTask.java	95.31% <0.00%> (-2.82%)	⬇️
...ain/java/org/opensearch/ad/task/ADTaskManager.java	72.99% <0.00%> (-0.90%)	⬇️
...opensearch/ad/indices/AnomalyDetectionIndices.java	51.09% <0.00%> (-0.63%)	⬇️
...java/org/opensearch/ad/task/ADBatchTaskRunner.java	87.82% <0.00%> (-0.58%)	⬇️