Create secret details page

What does this MR do and why?

Implements #424460 (closed). Depends on !152005 (merged)

This builds the secret details page for Secrets Management.

Note that the API is not yet available, so we're just mocking the data on the frontend.

MR acceptance checklist

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Screenshots or screen recordings

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Before	After (All fields)	After (Required fields only)

This also works with creating a secret (all values are saved in the apollo cache for now).

Screen_Recording_2024-06-04_at_13.18.59

How to set up and validate locally

1. Enable the ci_tanukey_ui feature flag for your project.
2. Visit <path-to-project>/-/secrets.
3. Click on a secret to view its details.