Armadactl doesn't cache OIDC tokens

[dimm0]

Describe the bug

When uisng OIDC for the armada client, the browser is opened on every request.

Expected behavior

Armada client caches the token on first request and re-uses one. If refresh token is available, should also try refreshing the token when current access token is about to expire.

Actual behavior

The client does OIDC authorization on every client run.

[dimm0]

LGTM in the pull request