Honour local claim dialect.

[Thisara-Welmilla]

Issue:

• Fix issues in authentication execution flow with custom authentication extension. wso2/product-is#22715

This PR fixes an issue where email resolution for sending an email OTP does not honor the local claim dialect.

If the authenticator's claim dialect is not the OIDC dialect, it directly checks for claim mapping. However, IdPs using the local claim dialect do not have claim mappings, causing the issue.

This fix ensures that if idp.isLocalClaimDialect() returns true, the email is retrieved using the WSO2 email claim.

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[codecov]

Codecov Report

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

Project coverage is 30.87%. Comparing base (995d970) to head (f7c98f8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ity/local/auth/emailotp/EmailOTPAuthenticator.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              @@
##               main      #38      +/-   ##
============================================
+ Coverage     27.12%   30.87%   +3.74%     
- Complexity      135      149      +14     
============================================
  Files             8        8              
  Lines          2997     2999       +2     
  Branches        855      858       +3     
============================================
+ Hits            813      926     +113     
+ Misses         2019     1901     -118     
- Partials        165      172       +7     

Flag	Coverage Δ
unit	32.28% <0.00%> (?)

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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13229016526

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PR builder started
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PR builder completed
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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13232470295
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13232470295