Revert "Update the username to login identifier value to display as the username."

[Malith-19]

Reverts #233

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/15560743183

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.57%. Comparing base (9600618) to head (12e18c8).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...tication/handler/identifier/IdentifierHandler.java	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #237      +/-   ##
============================================
+ Coverage     39.56%   39.57%   +0.01%     
  Complexity      207      207              
============================================
  Files            25       25              
  Lines          1759     1761       +2     
  Branches        313      313              
============================================
+ Hits            696      697       +1     
- Misses          943      944       +1     
  Partials        120      120              

Flag	Coverage Δ
unit	43.13% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/15560743183
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/15560743183