🪟 🐛 Poll backend for Free Connector Program enrollment success

[ambirdsall]

What

Closes #22302.

• when a user navigates to a page whose render invokes useFreeConnectorProgram() with the fcpEnrollmentSuccess query param, starts polling the FCP program info endpoint
• if polled return value ever says hasPaymentAccountSaved is true, stop polling, hide enrollment banners, and show success UI
• if 10s elapses with no enrollment, show an error popup instead

How

Adds a general-purpose pollUntil function, then uses that to poll the endpoint.

Recommended reading order

1. useFreeConnectorProgram.ts
2. pollUntil.ts or pollUntil.test.ts, depending on how you feel about rxjs, followed by the other

[josephkmh]

Nice utility! I imagine this could be useful for short polling in other instances 👍

[timroes]

We have pretty similar code in

airbyte/airbyte-webapp/src/packages/cloud/views/credits/CreditsPage/components/RemainingCredits.tsx

Lines 73 to 91 in 6a74106

	useEffectOnce(() => {
	// If we are coming back from a successfull stripe checkout ...
	if (searchParams.has(STRIPE_SUCCESS_QUERY)) {
	// Remove the stripe parameter from the URL
	setSearchParams({}, { replace: true });
	// If the workspace doesn't have a recent increase in credits our server has not yet
	// received the Stripe callback or updated the workspace information. We're going to
	// switch into a loading mode and relaod the workspace every 3s from now on until
	// the workspace has received the credit update (see useEffect below)
	if (!hasRecentCreditIncrease(cloudWorkspace)) {
	setIsWaitingForCredits(true);
	retryIntervalId.current = window.setInterval(() => {
	invalidateCloudWorkspace();
	}, 3000);
	}
	}
	return () => clearInterval(retryIntervalId.current);
	});

Maybe it's worth switching that also over to use the pollUntil utility.

[ambirdsall]

Great callout. We also do a bunch of manual interval wrangling for the health check endpoint, too; it would be good to consolidate our polling approaches.

That said, it would be nice to get this change merged to close an annoying edge case first, so I'm inclined to ship those updates as a follow up PR.