Check ORCID authentication enabled

[fbacall]

Summary of changes

• Hide "Authenticate your ORCID" option (and disable actions) if ORCID credentials are not set in config.
• Show "Link your ORCID" button if ORCID in profile is currently blank.

Motivation and context

500 error occurred when a user tried to authenticate an ORCID before the config was deployed.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.

[Copilot]

Pull request overview

This pull request adds a feature guard to prevent 500 errors when ORCID authentication credentials are not configured. It hides the ORCID authentication button when credentials are missing and provides different button text ("Link your ORCID" vs "Authenticate your ORCID") based on whether the user currently has an ORCID in their profile.

Changes:

• Added orcid_authentication_enabled? configuration method to check if ORCID credentials are present
• Added before_action guard in OrcidController to prevent access when feature is disabled
• Updated user profile view to conditionally show ORCID authentication button based on configuration
• Added comprehensive test coverage for the new feature guard

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
config/application.rb	Added orcid_authentication_enabled? method to check if ORCID credentials are configured
app/controllers/orcid_controller.rb	Added orcid_auth_enabled before_action to raise RoutingError when feature is disabled
app/views/users/show.html.erb	Updated conditional logic to check feature availability and show appropriate button text
config/locales/en.yml	Added new translation key orcid.link for "Link your ORCID" button text
test/controllers/users_controller_test.rb	Added tests for button visibility with different ORCID states and feature disabled scenarios
test/controllers/orcid_controller_test.rb	Added tests to verify controller actions raise errors when feature is disabled

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