Fix user name association in PostAuthAssociationHandler for configured idp subject identifier

[kayathiri4]

Fixes wso2/product-is#21465

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 4.22535% with 68 lines in your changes missing coverage. Please review.

Project coverage is 41.02%. Comparing base (85e4e76) to head (12227df).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...impl/JITProvisioningPostAuthenticationHandler.java	9.09%	28 Missing and 2 partials ⚠️
.../authentication/framework/util/FrameworkUtils.java	0.00%	27 Missing ⚠️
...ndler/request/impl/PostAuthAssociationHandler.java	0.00%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6125      +/-   ##
============================================
+ Coverage     40.77%   41.02%   +0.24%     
- Complexity    14474    14654     +180     
============================================
  Files          1772     1775       +3     
  Lines        117761   118417     +656     
  Branches      19116    19216     +100     
============================================
+ Hits          48019    48579     +560     
- Misses        62451    62536      +85     
- Partials       7291     7302      +11     

Flag	Coverage Δ
unit	25.45% <4.22%> (+0.48%)	⬆️

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