SingIn event triggered more that once

[rido-min]

After a successful OAuth flow, the event signin is triggered multiple times.

teams.ts/tests/graph/src/index.ts

Lines 41 to 44 in 9b8507d

	app.event('signin', async ({ send, userGraph, token }) => {
	const me = await userGraph.call(endpoints.me.get);
	await send(`user "${me.displayName}" signed in. Here's the token: ${JSON.stringify(token)}`);
	});

based on the number of clients that are already receiving the OAuth card we will see more duplicated events.