[cleanup] remove unused config messagePublishBufferCheckIntervalInMillis

[dao-jun]

Motivation

This config was introduced by #6178, but it never used.

Modifications

Remove unused config messagePublishBufferCheckIntervalInMillis

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

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

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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

If the box was checked, please highlight the changes

• 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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.20%. Comparing base (bbc6224) to head (2cff3c1).
Report is 1068 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #24252      +/-   ##
============================================
+ Coverage     73.57%   74.20%   +0.62%     
+ Complexity    32624    32565      -59     
============================================
  Files          1877     1866      -11     
  Lines        139502   144971    +5469     
  Branches      15299    16561    +1262     
============================================
+ Hits         102638   107569    +4931     
+ Misses        28908    28880      -28     
- Partials       7956     8522     +566     

Flag	Coverage Δ
inttests	26.72% <ø> (+2.13%)	⬆️
systests	23.30% <ø> (-1.03%)	⬇️
unittests	73.68% <ø> (+0.83%)	⬆️

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

Files with missing lines	Coverage Δ
...org/apache/pulsar/broker/ServiceConfiguration.java	98.16% <ø> (-1.24%)	⬇️

... and 1080 files with indirect coverage changes

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[lhotari]

LGTM