Redesign the sign-in page to show email/password form inline
with OIDC provider buttons (with vendor icons) instead of
separate pages. Extract OIDCProvider type to its own file.
Replace errgroup with sync.WaitGroup + WithCancelCause for
graceful shutdown in IAM services. Refactor garbage collectors
to use functional options and time.Ticker instead of
time.After to avoid repeated allocations.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
83468db034