refine the minion task progress api a bit

[klsince]

Refine a bit about the API reporting finer grained minion task progress status and bugfix

[zhtaoxiang]

LGTM

[codecov-commenter]

Codecov Report

Merging #9482 (f0a51ff) into master (2daa863) will increase coverage by 34.75%.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##             master    #9482       +/-   ##
=============================================
+ Coverage     35.09%   69.84%   +34.75%     
- Complexity      189     5140     +4951     
=============================================
  Files          1915     1915               
  Lines        101994   101991        -3     
  Branches      15468    15469        +1     
=============================================
+ Hits          35791    71240    +35449     
+ Misses        63158    25721    -37437     
- Partials       3045     5030     +1985     

Flag	Coverage Δ
integration1	25.94% <12.50%> (-0.05%)	⬇️
integration2	24.70% <0.00%> (?)
unittests1	67.09% <ø> (?)
unittests2	15.51% <37.50%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...in/java/org/apache/pinot/spi/utils/StringUtil.java	81.81% <ø> (+81.81%)	⬆️
.../pinot/minion/taskfactory/TaskFactoryRegistry.java	79.41% <33.33%> (ø)
...lix/core/minion/PinotHelixTaskResourceManager.java	41.46% <50.00%> (+1.73%)	⬆️
...che/pinot/minion/event/MinionProgressObserver.java	77.50% <100.00%> (ø)
...roller/helix/core/relocation/SegmentRelocator.java	72.97% <0.00%> (-5.41%)	⬇️
...troller/helix/core/retention/RetentionManager.java	79.03% <0.00%> (-4.84%)	⬇️
...nction/DistinctCountBitmapAggregationFunction.java	49.22% <0.00%> (-4.67%)	⬇️
...r/validation/RealtimeSegmentValidationManager.java	72.97% <0.00%> (-4.06%)	⬇️
...pache/pinot/minion/event/MinionEventObservers.java	89.65% <0.00%> (-1.73%)	⬇️
...controller/helix/core/minion/PinotTaskManager.java	66.56% <0.00%> (-1.47%)	⬇️
... and 1104 more

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