UI enhancements for the upcoming JWT authentication method

[pkazmierczak]

Currently, Nomad UI supports logging in via an SSO if an ACL Auth Method is detected in the state store. Unauthenticated users are then presented with the following message:

And later when then click on either the auth method name or the Nomad ACL Token link, they are redirected to the following:

We will soon introduce a new auth method type, JWT, that does not require a redirect to a 3rd party provider, and in fact is just a string of characters much like the Nomad ACL Token. I see two possible ways we could address this in the UI:

• Detect if the type of an ACL Auth Method is JWT or OIDC, and present a different dialog to the user depending on that, or:
• Detect the shape of the token that is being pasted into the "Secret ID" text field. If it's JWT-shaped, call the /v1/acl/login endpoint, if it's not, treat it as a Nomad ACL Token.

The new /acl/login endpoint will expect an auth method name (just like the OIDC endpoint), and a token.

[pkazmierczak]

FYI all the backend code has been reviewed and merged into a feature branch; could be useful for testing.

[philrenaud]

Resolved by #16625 and #16665

[github-actions]

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