Set IS_USER_RESOLVED property when ValidateUsername is enabled from adaptive script

[PasinduYeshan]

In the Identifier First, when the ValidateUsername is configured as authenticator config, the user is resolved and the isUserResolved flag is correctly set in the authentication context. However, when ValidateUsername is set via an adaptive authentication script parameter, the user is still resolved, but isUserResolved is not set in the context.

This PR ensures that isUserResolved is correctly set in the context even when ValidateUsername is enabled through the adaptive authentication script.

Refer:

• Issue with Login from Pass-Key when Identifier-First is set as first login step wso2/product-is#24154

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 39.56%. Comparing base (635524b) to head (9600618).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
...tication/handler/identifier/IdentifierHandler.java	0.00%	2 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     #231      +/-   ##
============================================
+ Coverage     39.23%   39.56%   +0.33%     
+ Complexity      209      207       -2     
============================================
  Files            25       25              
  Lines          1784     1759      -25     
  Branches        315      313       -2     
============================================
- Hits            700      696       -4     
+ Misses          963      943      -20     
+ Partials        121      120       -1     

Flag	Coverage Δ
unit	43.12% <0.00%> (-0.03%)	⬇️

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 started
Link: https://github.com/wso2/product-is/actions/runs/15282358395

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/15282358395
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/15282358395