Drop the dead MongoDB oplog-tailing code from mongoclient

[delthas]

The mongoclient LogConsumer (and its ListRecordStream) tailed MongoDB's internal replica-set oplog (local.oplog.rs). It has been broken on MongoDB >= 7.1 since the oplog h field it uses as a cursor was removed — ARSN-545, closed Won't Fix — and its only consumer org-wide, backbeat's MongoLogReader (logSource: "mongo"), was removed in BB-836 (scality/backbeat#2795).

Changes:

• Delete lib/storage/metadata/mongoclient/LogConsumer.js and ListRecordStream.js, their unit tests, and the LogConsumer export from the mongoclient block in index.ts.
• MongoReadStream (readStream.js) remains — used by MongoClientInterface for listings, unrelated to the oplog. The bucketclient LogConsumer (raft log) is untouched.

To land after scality/backbeat#2795 merges. Backbeat branches < 9.5 still reference this export but pin arsenal by commit, so they are unaffected until an arsenal bump.

Issue: ARSN-622

[bert-e]

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[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.59%. Comparing base (e4fdcc8) to head (a309450).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           development/8.5    #2684      +/-   ##
===================================================
- Coverage            74.73%   74.59%   -0.14%     
===================================================
  Files                  229      227       -2     
  Lines                18695    18567     -128     
  Branches              3894     3842      -52     
===================================================
- Hits                 13971    13850     -121     
+ Misses                4719     4712       -7     
  Partials                 5        5              

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