[Backport 2.x] Validate checksum in footer separately for segment metadata files

[opensearch-trigger-bot]

Backport 1856090 from #6931.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString
      2 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.split/30_copy_settings/Copy settings during split index}
      1 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=pit/10_basic/Delete all}

• URL: https://build.ci.opensearch.org/job/gradle-check/13371/
• CommitID: e1d5aea
  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 #6973 (e1d5aea) into 2.x (5cf4c5d) will increase coverage by 0.00%.
The diff coverage is 57.77%.

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@@            Coverage Diff            @@
##                2.x    #6973   +/-   ##
=========================================
  Coverage     70.42%   70.42%           
- Complexity    59500    59512   +12     
=========================================
  Files          4811     4811           
  Lines        285539   285564   +25     
  Branches      41509    41512    +3     
=========================================
+ Hits         201086   201111   +25     
- Misses        67682    67699   +17     
+ Partials      16771    16754   -17     

Impacted Files	Coverage Δ
...ensearch/cluster/routing/WeightedRoutingUtils.java	68.42% <0.00%> (-8.05%)	⬇️
...rg/opensearch/common/settings/ClusterSettings.java	92.50% <ø> (ø)
...g/opensearch/cluster/routing/OperationRouting.java	79.87% <38.88%> (-3.58%)	⬇️
...arch/cluster/routing/FailAwareWeightedRouting.java	74.41% <62.50%> (-1.90%)	⬇️
...search/cluster/routing/IndexShardRoutingTable.java	88.77% <72.72%> (+1.34%)	⬆️
...nsearch/common/io/VersionedCodecStreamWrapper.java	90.47% <100.00%> (-9.53%)	⬇️
...earch/index/store/RemoteSegmentStoreDirectory.java	99.31% <100.00%> (+<0.01%)	⬆️

... and 458 files with indirect coverage changes

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