Refactor sign-in page and IAM service lifecycle

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>

packages/ui/src/Atoms/Vendors/Microsoft.tsx

@@ -0,0 +1,19 @@
+import type { ComponentProps } from "react";
+
+export function Microsoft(props: ComponentProps<"svg">) {
+  return (
+    <svg
+      width="800px"
+      height="800px"
+      viewBox="0 0 256 256"
+      xmlns="http://www.w3.org/2000/svg"
+      preserveAspectRatio="xMidYMid"
+      {...props}
+    >
+      <rect x="0" y="0" width="121" height="121" fill="#F25022" />
+      <rect x="135" y="0" width="121" height="121" fill="#7FBA00" />
+      <rect x="0" y="135" width="121" height="121" fill="#00A4EF" />
+      <rect x="135" y="135" width="121" height="121" fill="#FFB900" />
+    </svg>
+  );
+}

packages/ui/src/Atoms/Vendors/index.ts

@@ -1,2 +1,3 @@
 export { Google } from "./Google";
+export { Microsoft } from "./Microsoft";
 export { Slack } from "./Slack";