enable parallel Maven in pinot linter script

[sullis]

https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.68%. Comparing base (59551e4) to head (4122b1f).
Report is 206 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #12751       +/-   ##
=============================================
- Coverage     61.75%   46.68%   -15.07%     
- Complexity      207      953      +746     
=============================================
  Files          2436     1856      -580     
  Lines        133233    98076    -35157     
  Branches      20636    15807     -4829     
=============================================
- Hits          82274    45788    -36486     
- Misses        44911    48995     +4084     
+ Partials       6048     3293     -2755     

Flag	Coverage Δ
custom-integration1	?
integration	?
integration1	?
integration2	?
java-11	46.68% <ø> (-15.03%)	⬇️
java-21	?
skip-bytebuffers-false	46.68% <ø> (-15.07%)	⬇️
skip-bytebuffers-true	?
temurin	46.68% <ø> (-15.07%)	⬇️
unittests	46.68% <ø> (-15.07%)	⬇️
unittests1	46.68% <ø> (-0.21%)	⬇️
unittests2	?

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