Remove TaskType from ThreadExecutionContext

[Jackie-Jiang]

This PR removes the TaskType enum from ThreadExecutionContext and simplifies the threading accounting code by removing unnecessary task type tracking. The changes include updating setupRunner and setupWorker methods to remove taskType parameters, updating all call sites across broker, core, query-runtime, and SPI modules, and updating test cases to reflect the API changes.

NOTE: ThreadAccountant related functions are changed in SPI, but they should be internal only as of now

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.33%. Comparing base (962f45c) to head (2bb2998).

Files with missing lines	Patch %	Lines
...requesthandler/MultiStageBrokerRequestHandler.java	0.00%	1 Missing ⚠️
...accounting/CPUMemThreadLevelAccountingObjects.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16633      +/-   ##
============================================
+ Coverage     63.28%   63.33%   +0.04%     
  Complexity     1379     1379              
============================================
  Files          3027     3026       -1     
  Lines        176446   176434      -12     
  Branches      27074    27073       -1     
============================================
+ Hits         111671   111743      +72     
+ Misses        56203    56120      -83     
+ Partials       8572     8571       -1     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.25% <90.47%> (-0.02%)	⬇️
java-21	63.31% <90.47%> (+0.05%)	⬆️
temurin	63.33% <90.47%> (+0.04%)	⬆️
unittests	63.33% <90.47%> (+0.04%)	⬆️
unittests1	56.44% <94.73%> (+0.03%)	⬆️
unittests2	33.17% <4.76%> (+0.02%)	⬆️

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