Add support for email domain based organization discovery during self-registration.

[Yasasr1]

Purpose

This PR improves the organization SSO authenticator to allow the use of existing organization discovery capabilities during the self-registration flow as well.

Two new parameters are used to enable this capability

• isSelfRegistration: This is used in the organization discovery page to conditionally render organization name based organization discovery content. (organization name based discovery capability is not provided in the self-registration flow)
• discoveredUsername: This is resolved from the provided username in domain discovery page. Used to auto complete the email in the self-registration page

Related issue

• Improve organization SSO authenticator to handle email domain based organization discovery for self-registration wso2/product-is#21596

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.26%. Comparing base (4c60673) to head (409aa2f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../organization/login/OrganizationAuthenticator.java	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #51      +/-   ##
============================================
+ Coverage     59.63%   62.26%   +2.62%     
+ Complexity      178      163      -15     
============================================
  Files             4        4              
  Lines           934      946      +12     
  Branches        120      125       +5     
============================================
+ Hits            557      589      +32     
+ Misses          319      296      -23     
- Partials         58       61       +3     

Flag	Coverage Δ
unit	45.58% <83.33%> (+8.47%)	⬆️

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.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12085224255

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12085224255
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12085224255