Fix SAML name ID format inconsistency

[SujanSanjula96]

From this fix, we fix the inconsistency in API response regarding the SAML name ID format.

Public Issue - wso2/product-is#21826

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 46.86%. Comparing base (8ab8362) to head (4c5d03c).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...on/identity/sso/saml/admin/SAMLSSOConfigAdmin.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #436      +/-   ##
============================================
- Coverage     46.89%   46.86%   -0.03%     
  Complexity     1343     1343              
============================================
  Files           116      116              
  Lines          9223     9226       +3     
  Branches       1090     1091       +1     
============================================
- Hits           4325     4324       -1     
- Misses         4294     4298       +4     
  Partials        604      604              

Flag	Coverage Δ
unit	19.54% <0.00%> (-0.01%)	⬇️

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[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12622470170

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12622470170
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12622470170

[SujanSanjula96]

Unit tests are written to cover the changes done in this PR even though it is not identified by the codecov.