Address multiple users exist in different user stores when recovering username

[sadilchamishka]

Proposed changes in this pull request

Related Issues

• Username Recovery Notification failure with non unique users from Secondary Userstore wso2/product-is#22169

As the default email template is configured as below, receive multiple emails with domain qualified usernames.

<b>{{userstore-domain}}/{{user-name}}</b>

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 51.02%. Comparing base (55bf5a4) to head (6c38590).

Files with missing lines	Patch %	Lines
...ice/impl/username/UsernameRecoveryManagerImpl.java	55.55%	2 Missing and 2 partials ⚠️
.../org/wso2/carbon/identity/recovery/util/Utils.java	60.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #906      +/-   ##
============================================
+ Coverage     50.91%   51.02%   +0.11%     
- Complexity     2431     2435       +4     
============================================
  Files           298      298              
  Lines         17979    17995      +16     
  Branches       2585     2590       +5     
============================================
+ Hits           9154     9182      +28     
+ Misses         7673     7655      -18     
- Partials       1152     1158       +6     

Flag	Coverage Δ
unit	38.54% <60.00%> (+0.12%)	⬆️

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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12708280884