[improve][broker] Remove unused method CompactionRecord.reset

[dragosvictor]

Motivation

Remove unused methods CompactionRecord::reset and caller CompactionRecordMXBeanImpl::reset. These methods are not used anywhere outside of the tests. Mistakenly using them can cause the topic compaction metrics to be invalidated.

Modifications

Trivial cleanup.

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: dragosvictor#21

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.73%. Comparing base (bbc6224) to head (479bb70).
Report is 240 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22670      +/-   ##
============================================
- Coverage     73.57%   72.73%   -0.85%     
+ Complexity    32624    32550      -74     
============================================
  Files          1877     1887      +10     
  Lines        139502   141053    +1551     
  Branches      15299    15481     +182     
============================================
- Hits         102638   102590      -48     
- Misses        28908    30584    +1676     
+ Partials       7956     7879      -77     

Flag	Coverage Δ
inttests	27.43% <ø> (+2.85%)	⬆️
systests	24.70% <ø> (+0.38%)	⬆️
unittests	71.49% <ø> (-1.35%)	⬇️

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

Files	Coverage Δ
...org/apache/pulsar/compaction/CompactionRecord.java	100.00% <ø> (ø)
.../apache/pulsar/compaction/CompactorMXBeanImpl.java	94.44% <ø> (-0.56%)	⬇️

... and 353 files with indirect coverage changes