Reducing the token synchronize weight for existing tokens

[indeewari]

Proposed changes in this pull request

The synchronize block at the token issuance path seems to lock read only flow, where issuing existing token. For readonly flow, there is no requirement of a synchronize lock. This refactoring reduces the traffic at the synchronized block.

When should this PR be merged

After approval of the Authorization product team and the product owner.

Follow up actions

PR builder test success and QA approval.

[codecov]

Codecov Report

Attention: Patch coverage is 29.16667% with 17 lines in your changes missing coverage. Please review.

Project coverage is 55.75%. Comparing base (8a01652) to head (5606e85).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
...dlers/grant/AbstractAuthorizationGrantHandler.java	29.16%	13 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2660      +/-   ##
============================================
- Coverage     56.39%   55.75%   -0.64%     
- Complexity     8267     8415     +148     
============================================
  Files           632      632              
  Lines         46681    48509    +1828     
  Branches       8508     8968     +460     
============================================
+ Hits          26324    27047     +723     
- Misses        16592    17615    +1023     
- Partials       3765     3847      +82     

Flag	Coverage Δ
unit	38.94% <29.16%> (+0.16%)	⬆️

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Link: https://github.com/wso2/product-is/actions/runs/12686897131
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