Improving API description to capture the functionality

[9aman]

1. The current description of the API @Path("/tasks/subtask/{taskName}/config") is minimal and doesn't capture all the actions performed by the API.
2. Improve the API description and capture how the API handles the absence of query params internally.
3. This will help reduce ambiguity for the users.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 62.09%. Comparing base (59551e4) to head (75699b3). Report is 717 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13539      +/-   ##
============================================
+ Coverage     61.75%   62.09%   +0.34%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2557     +121     
  Lines        133233   140887    +7654     
  Branches      20636    21855    +1219     
============================================
+ Hits          82274    87481    +5207     
- Misses        44911    46791    +1880     
- Partials       6048     6615     +567     

Flag	Coverage Δ
custom-integration1	<0.01% <ø> (-0.01%)	:arrow_down:
integration	<0.01% <ø> (-0.01%)	:arrow_down:
integration1	<0.01% <ø> (-0.01%)	:arrow_down:
integration2	0.00% <ø> (ø)
java-11	62.06% <ø> (+0.35%)	:arrow_up:
java-21	61.95% <ø> (+0.32%)	:arrow_up:
skip-bytebuffers-false	62.08% <ø> (+0.33%)	:arrow_up:
skip-bytebuffers-true	61.92% <ø> (+34.19%)	:arrow_up:
temurin	62.09% <ø> (+0.34%)	:arrow_up:
unittests	62.08% <ø> (+0.34%)	:arrow_up:
unittests1	46.68% <ø> (-0.22%)	:arrow_down:
unittests2	27.65% <ø> (-0.09%)	:arrow_down:

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