update ControllerJobType from enum to string

[zhtaoxiang]

update ControllerJobType from enum to string to make it flexible to extend

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 21.42857% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 61.59%. Comparing base (59551e4) to head (1e607bb).
Report is 28 commits behind head on master.

Files	Patch %	Lines
...oller/api/resources/PinotTableRestletResource.java	0.00%	5 Missing ⚠️
...ntroller/helix/core/PinotHelixResourceManager.java	20.00%	4 Missing ⚠️
...ache/pinot/common/metadata/ZKMetadataProvider.java	0.00%	1 Missing ⚠️
...mmon/metadata/controllerjob/ControllerJobType.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12518      +/-   ##
============================================
- Coverage     61.75%   61.59%   -0.16%     
  Complexity      207      207              
============================================
  Files          2436     2450      +14     
  Lines        133233   133500     +267     
  Branches      20636    20684      +48     
============================================
- Hits          82274    82226      -48     
- Misses        44911    45176     +265     
- Partials       6048     6098      +50     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	27.71% <21.42%> (-34.00%)	⬇️
java-21	34.85% <0.00%> (-26.78%)	⬇️
skip-bytebuffers-false	61.59% <21.42%> (-0.16%)	⬇️
skip-bytebuffers-true	0.00% <0.00%> (-27.73%)	⬇️
temurin	61.59% <21.42%> (-0.16%)	⬇️
unittests	61.58% <21.42%> (-0.16%)	⬇️
unittests1	46.67% <0.00%> (-0.22%)	⬇️
unittests2	27.71% <21.42%> (-0.02%)	⬇️

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