Fix unnecessary DB queries when revoking tokens

[SujanSanjula96]

Proposed changes in this pull request

From this PR,

• Fixed unnecessary DB queries due to invoking getRoles method.
• Removed the usage of getting associated applications since it is unnecessary.
• Refactored unnecessary iterations related to associated applications.

Issue - wso2/product-is#21496

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.

Project coverage is 56.41%. Comparing base (654bc26) to head (a82357a).

Files with missing lines	Patch %	Lines
...java/org/wso2/carbon/identity/oauth/OAuthUtil.java	0.00%	24 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2640      +/-   ##
============================================
- Coverage     56.43%   56.41%   -0.02%     
+ Complexity     8188     8177      -11     
============================================
  Files           632      632              
  Lines         46323    46316       -7     
  Branches       8245     8242       -3     
============================================
- Hits          26141    26130      -11     
- Misses        16469    16470       +1     
- Partials       3713     3716       +3     

Flag	Coverage Δ
unit	38.69% <0.00%> (+0.03%)	⬆️

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