fix(user_auth_methods): Handle email domains not having any auth methods in terminate auth select

[ThisIsMani]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Added a check to see if the auth methods list of the email domain of the user is empty.

If it is empty, then we will allow the user to continue with the flow.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

Closes juspay/hyperswitch-control-center#4004

How did you test it?

curl 'http://localhost:9000/api/user/auth/select' \
  -H 'authorization: Bearer JWT' \
  --data-raw '{"id":"bcc53b5e-d97a-4249-855d-acf594755e1b"}'

Above API should give 200 OK in case of Okta setup without any email domain.

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/router/src/core/user.rs	0% smaller

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@f8fa541). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
crates/router/src/core/user.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

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