[Backport 1.x] Add auto labeler workflow

[opensearch-trigger-bot]

Backport 3bdb4f6 from #455

[codecov-commenter]

Codecov Report

Merging #459 (3bdb4f6) into 1.x (68d2a4e) will increase coverage by 0.64%.
The diff coverage is 75.85%.

❗ Current head 3bdb4f6 differs from pull request most recent head ab0e7f3. Consider uploading reports for the commit ab0e7f3 to get more accurate results

@@             Coverage Diff              @@
##                1.x     #459      +/-   ##
============================================
+ Coverage     77.68%   78.33%   +0.64%     
- Complexity     4109     4172      +63     
============================================
  Files           296      296              
  Lines         17669    17657      -12     
  Branches       1878     1879       +1     
============================================
+ Hits          13727    13832     +105     
+ Misses         3040     2945      -95     
+ Partials        902      880      -22     

Flag	Coverage Δ
plugin	78.33% <75.85%> (+0.64%)	⬆️

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

Impacted Files	Coverage Δ
.../java/org/opensearch/ad/AbstractProfileRunner.java	100.00% <ø> (ø)
src/main/java/org/opensearch/ad/ExpiringState.java	100.00% <ø> (ø)
.../main/java/org/opensearch/ad/MaintenanceState.java	100.00% <ø> (ø)
src/main/java/org/opensearch/ad/Name.java	100.00% <ø> (ø)
...opensearch/ad/breaker/ADCircuitBreakerService.java	91.66% <ø> (ø)
...in/java/org/opensearch/ad/breaker/BreakerName.java	100.00% <ø> (ø)
...rg/opensearch/ad/breaker/MemoryCircuitBreaker.java	100.00% <ø> (ø)
...opensearch/ad/breaker/ThresholdCircuitBreaker.java	100.00% <ø> (ø)
.../java/org/opensearch/ad/caching/CacheProvider.java	100.00% <ø> (ø)
...main/java/org/opensearch/ad/cluster/DailyCron.java	100.00% <ø> (ø)
... and 332 more