move jobId out of rebalanceConfig as it's more like a runtime context

[klsince]

Move jobId out of rebalanceConfig as it's more like a runtime context. And as in the table rebalance restful API, jobId is not provided by caller but auto-gen'ed and returned to caller.

[codecov-commenter]

Codecov Report

Merging #11790 (70aa6e0) into master (884dbdb) will increase coverage by 0.00%.
Report is 4 commits behind head on master.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##             master   #11790    +/-   ##
==========================================
  Coverage     63.12%   63.13%            
- Complexity     1118     1140    +22     
==========================================
  Files          2342     2343     +1     
  Lines        125996   126305   +309     
  Branches      19378    19419    +41     
==========================================
+ Hits          79541    79742   +201     
- Misses        40791    40890    +99     
- Partials       5664     5673     +9     

Flag	Coverage Δ
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	63.08% <61.53%> (+0.02%)	⬆️
java-17	63.00% <61.53%> (+48.55%)	⬆️
java-20	62.97% <61.53%> (-0.03%)	⬇️
temurin	63.13% <61.53%> (+<0.01%)	⬆️
unittests	63.12% <61.53%> (+<0.01%)	⬆️
unittests1	67.25% <ø> (-0.01%)	⬇️
unittests2	14.43% <61.53%> (-0.04%)	⬇️

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

Files	Coverage Δ
...ntroller/helix/core/PinotHelixResourceManager.java	63.45% <100.00%> (-0.03%)	⬇️
...ntroller/helix/core/rebalance/RebalanceConfig.java	100.00% <ø> (ø)
...ntroller/helix/core/rebalance/TableRebalancer.java	68.52% <ø> (-0.07%)	⬇️
...core/rebalance/tenant/DefaultTenantRebalancer.java	61.60% <83.33%> (+0.20%)	⬆️
...oller/api/resources/PinotTableRestletResource.java	45.74% <50.00%> (ø)
...roller/helix/core/relocation/SegmentRelocator.java	52.34% <0.00%> (ø)

... and 56 files with indirect coverage changes

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