refactor: harden msteams lifecycle and attachment flows

extensions/msteams/src/revoked-context.ts

@@ -0,0 +1,17 @@
+import { isRevokedProxyError } from "./errors.js";
+
+export async function withRevokedProxyFallback<T>(params: {
+  run: () => Promise<T>;
+  onRevoked: () => Promise<T>;
+  onRevokedLog?: () => void;
+}): Promise<T> {
+  try {
+    return await params.run();
+  } catch (err) {
+    if (!isRevokedProxyError(err)) {
+      throw err;
+    }
+    params.onRevokedLog?.();
+    return await params.onRevoked();
+  }
+}