[improve][sec] Revert "Add group pulsar and add user pulsar to it instead of root"

[yaalsn]

Motivation

Reverts #21084. Because the change breaks OpenShift support.

Modifications

Verifying this change

• Make sure that the change passes the CI checks.

Documentation

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

[codecov-commenter]

Codecov Report

Merging #21691 (2c117bb) into master (f25b082) will increase coverage by 38.90%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #21691       +/-   ##
=============================================
+ Coverage     34.49%   73.39%   +38.90%     
- Complexity    12116    32751    +20635     
=============================================
  Files          1716     1893      +177     
  Lines        131152   140754     +9602     
  Branches      14327    15503     +1176     
=============================================
+ Hits          45236   103307    +58071     
+ Misses        79828    29343    -50485     
- Partials       6088     8104     +2016     

Flag	Coverage Δ
inttests	24.11% <28.57%> (?)
systests	24.70% <28.57%> (-0.03%)	⬇️
unittests	72.69% <100.00%> (+40.91%)	⬆️

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

Files	Coverage Δ
...che/bookkeeper/mledger/impl/ManagedLedgerImpl.java	80.78% <100.00%> (+34.60%)	⬆️
...org/apache/pulsar/broker/ServiceConfiguration.java	99.38% <100.00%> (+1.32%)	⬆️
...rg/apache/pulsar/compaction/TwoPhaseCompactor.java	73.94% <100.00%> (+5.88%)	⬆️

... and 1476 files with indirect coverage changes