Add auto labeler workflow

[ohltyler]

Signed-off-by: Tyler Ohlsen ohltyler@amazon.com

Description

Similar to frontend PR, this adds a GHA and corresponding config file to auto-label opened PRs to main. See other PR for more details.

Still defaulting everything to 1.x for now, may move to 2.x once that branch is available, and the main has bumped to 2.0 compatibility.

Check List

• Commits are signed per the DCO using --signoff

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[ylwu-amzn]

LGTM. Thanks! Can you also help add this to ml-commons?

[ohltyler]

LGTM. Thanks! Can you also help add this to ml-commons?

Yes, I'll handle that

[codecov-commenter]

Codecov Report

Merging #455 (4e0ce87) into main (2505add) will decrease coverage by 0.27%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #455      +/-   ##
============================================
- Coverage     78.14%   77.86%   -0.28%     
+ Complexity     4162     4149      -13     
============================================
  Files           296      296              
  Lines         17657    17657              
  Branches       1879     1879              
============================================
- Hits          13798    13749      -49     
- Misses         2975     3026      +51     
+ Partials        884      882       -2     

Flag	Coverage Δ
plugin	77.86% <ø> (-0.28%)	⬇️

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

Impacted Files	Coverage Δ
.../java/org/opensearch/ad/AnomalyDetectorRunner.java	37.64% <0.00%> (-5.89%)	⬇️
...c/main/java/org/opensearch/ad/util/ParseUtils.java	73.83% <0.00%> (-3.95%)	⬇️
...va/org/opensearch/ad/feature/SearchFeatureDao.java	82.78% <0.00%> (-3.86%)	⬇️
...ain/java/org/opensearch/ad/model/ModelProfile.java	69.09% <0.00%> (-3.64%)	⬇️
...ansport/handler/AnomalyResultBulkIndexHandler.java	67.74% <0.00%> (-3.23%)	⬇️
...port/SearchAnomalyDetectorInfoTransportAction.java	64.44% <0.00%> (-2.23%)	⬇️
...ain/java/org/opensearch/ad/task/ADTaskManager.java	75.24% <0.00%> (-1.36%)	⬇️
...opensearch/ad/indices/AnomalyDetectionIndices.java	72.09% <0.00%> (-0.19%)	⬇️
...rch/ad/transport/AnomalyResultTransportAction.java	80.13% <0.00%> (ø)
...ava/org/opensearch/ad/task/ADTaskCacheManager.java	89.31% <0.00%> (+0.95%)	⬆️