[Backport 2.19] Migrating from commons-lang2.6 to commons-lang3.18

[opensearch-trigger-bot]

Backport e30a14e from #1525.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.64%. Comparing base (0bc2079) to head (e32fbb6).
Report is 1 commits behind head on 2.19.

Additional details and impacted files

@@             Coverage Diff              @@
##               2.19    #1526      +/-   ##
============================================
+ Coverage     81.62%   81.64%   +0.02%     
- Complexity     5869     5871       +2     
============================================
  Files           533      533              
  Lines         23665    23665              
  Branches       2374     2374              
============================================
+ Hits          19316    19322       +6     
+ Misses         3189     3183       -6     
  Partials       1160     1160              

Flag	Coverage Δ
plugin	81.64% <100.00%> (+0.02%)	⬆️

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

Files with missing lines	Coverage Δ
.../java/org/opensearch/ad/ml/ThresholdingResult.java	84.33% <ø> (ø)
.../java/org/opensearch/ad/model/AnomalyDetector.java	88.85% <ø> (ø)
...search/ad/model/AnomalyDetectorExecutionInput.java	97.56% <ø> (ø)
...in/java/org/opensearch/ad/model/AnomalyResult.java	78.97% <ø> (ø)
...a/org/opensearch/ad/model/AnomalyResultBucket.java	85.71% <ø> (ø)
...c/main/java/org/opensearch/ad/model/Condition.java	84.50% <ø> (ø)
...ava/org/opensearch/ad/model/ExpectedValueList.java	71.42% <ø> (ø)
src/main/java/org/opensearch/ad/model/Rule.java	86.84% <ø> (ø)
...arch/ad/rest/RestExecuteAnomalyDetectorAction.java	68.29% <ø> (ø)
...arch/ad/rest/RestPreviewAnomalyDetectorAction.java	77.50% <ø> (ø)
... and 27 more

... and 6 files with indirect coverage changes

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