[Backport 2.x] [Manual backport] Remove COMPRESSOR variable from CompressorFactory (#7907)

[willyborankin]

Manual Backport 1b833b1 from #7907

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/17536/
• CommitID: a7f75b5
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[kartg]

@willyborankin please rebase to fix the gradle check failure. The failure was caused by a missing BWC version - #8061

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.remotestore.SegmentReplicationUsingRemoteStoreIT.testDropPrimaryDuringReplication

• URL: https://build.ci.opensearch.org/job/gradle-check/17647/
• CommitID: a67658d
  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]

Codecov Report

Merging #8055 (a67658d) into 2.x (b642e69) will increase coverage by 0.02%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##                2.x    #8055      +/-   ##
============================================
+ Coverage     70.68%   70.70%   +0.02%     
- Complexity    56849    56898      +49     
============================================
  Files          4702     4702              
  Lines        268993   268994       +1     
  Branches      39768    39768              
============================================
+ Hits         190133   190198      +65     
+ Misses        62606    62518      -88     
- Partials      16254    16278      +24     

Impacted Files	Coverage Δ
...java/org/opensearch/transport/TransportLogger.java	39.32% <0.00%> (ø)
...rg/opensearch/transport/TransportDecompressor.java	74.02% <50.00%> (+0.34%)	⬆️
...ster/coordination/PublicationTransportHandler.java	85.85% <100.00%> (ø)
...opensearch/common/compress/CompressedXContent.java	85.93% <100.00%> (ø)
.../opensearch/common/compress/CompressorFactory.java	66.66% <100.00%> (+9.52%)	⬆️
...ch/repositories/blobstore/BlobStoreRepository.java	62.26% <100.00%> (-0.59%)	⬇️
...earch/transport/CompressibleBytesOutputStream.java	81.81% <100.00%> (ø)

... and 465 files with indirect coverage changes