[Backport 2.x] Add workflow to publish maven snapshots

[opensearch-trigger-bot]

Backport 267e162 from #6394.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.cluster.routing.allocation.decider.DiskThresholdDeciderIT.testIndexCreateBlockIsRemovedWhenAnyNodesNotExceedHighWatermarkWithAutoReleaseEnabled

• URL: https://build.ci.opensearch.org/job/gradle-check/11578/
• CommitID: 8389ac8
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #6436 (8389ac8) into 2.x (f2faf01) will increase coverage by 0.02%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##                2.x    #6436      +/-   ##
============================================
+ Coverage     70.43%   70.45%   +0.02%     
- Complexity    59266    59279      +13     
============================================
  Files          4798     4798              
  Lines        284302   284302              
  Branches      41321    41321              
============================================
+ Hits         200234   200303      +69     
+ Misses        67328    67242      -86     
- Partials      16740    16757      +17     

Impacted Files	Coverage Δ
...ava/org/opensearch/action/NoSuchNodeException.java	0.00% <0.00%> (-50.00%)	⬇️
...cluster/coordination/PendingClusterStateStats.java	20.00% <0.00%> (-48.00%)	⬇️
...java/org/opensearch/threadpool/ThreadPoolInfo.java	56.25% <0.00%> (-37.50%)	⬇️
...nsearch/index/shard/IndexShardClosedException.java	66.66% <0.00%> (-33.34%)	⬇️
...opensearch/snapshots/SnapshotMissingException.java	28.57% <0.00%> (-28.58%)	⬇️
...regations/metrics/AbstractHyperLogLogPlusPlus.java	70.68% <0.00%> (-25.87%)	⬇️
...a/org/opensearch/index/mapper/MapperException.java	75.00% <0.00%> (-25.00%)	⬇️
...nsearch/index/shard/IndexingOperationListener.java	63.93% <0.00%> (-22.96%)	⬇️
...pensearch/index/mapper/MapperParsingException.java	77.77% <0.00%> (-22.23%)	⬇️
...adcast/BroadcastShardOperationFailedException.java	77.77% <0.00%> (-22.23%)	⬇️
... and 466 more

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