feat(auth): Add OAuth logout

[jan-law]

Fixes #717
Depends on cryostatio/cryostat-web#355
Depends on cryostatio/cryostat-operator#319
Depends on cryostatio/cryostat-operator#320

Please see the -web PR for more information about the OAuth server logout behaviour.

This PR also updates the web client and caches the logout redirect url.

[andrewazores]

Code looks pretty reasonable. I'll take a look at the OpenShift auth docs next.

[andrewazores]

This and cryostatio/cryostat-web#355 are looking pretty good. I'll wait until cryostatio/cryostat-operator#320 is resolved so I can also test that out - right now I'm seeing the (currently expected) CORS failure when trying to log out from the admin account.

[jan-law]

Note: The "Token Authentication" section in https://cryostat.io/get-started/ should also be updated when this OAuth feature becomes available in the next Cryostat release.

[jan-law]

Rebased just now. The only conflict was fixed by rebasing the web-client with the latest web-client commits on the main branch.

[andrewazores]

LGTM otherwise. I would be okay with deferring my one suggestion above to a follow-up PR as well if you'd prefer, since that sort of cleanup also might change exception handling and the exceptions that are reported to the web-client.

[github-actions]

This PR/issue depends on:

• feat(auth): Add OAuth logout cryostat-web#355
• feat(auth): Add logout permissions to service account cryostat-operator#319
• Add cryostat origin to APIServer CORS allowed origins cryostat-operator#320
  By Dependent Issues (🤖). Happy coding!