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 62.50000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 55.48%. Comparing base (654bc26) to head (c14d5ef).
Report is 53 commits behind head on master.

Files with missing lines	Patch %	Lines
...java/org/wso2/carbon/identity/oauth/OAuthUtil.java	62.50%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2640      +/-   ##
============================================
- Coverage     56.44%   55.48%   -0.96%     
- Complexity     8193     8536     +343     
============================================
  Files           632      632              
  Lines         46331    49870    +3539     
  Branches       8246     9295    +1049     
============================================
+ Hits          26151    27672    +1521     
- Misses        16465    18254    +1789     
- Partials       3715     3944     +229     

Flag	Coverage Δ
unit	38.95% <62.50%> (+0.29%)	⬆️

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