[25.1] Fix loading of credentials when associated tools are missing

[arash77]

Ensure we can still display user credentials even when the associated tools are unavailable. This change includes a fallback definition for credentials in such cases and adds a test to verify the functionality.
closes #21548

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[itisAliRH]

Thank you @arash77!
I fixed the UI:

[bgruening]

Should that go to 25.1?

[davelopez]

Thank you!