React: Don't set `react.componentStack` context

[timfish]

In captureReactException we set a react context with the raw error.stack:

sentry-javascript/packages/react/src/error.ts

Lines 67 to 70 in 7647e72

	return withScope(scope => {
	scope.setContext('react', { componentStack });
	return captureException(error, hint);
	});

This context will never have sourcemaps applied so it will be mostly useless to users. For React >= v17 the stack also gets included in the error and will have sourcemaps applied.

A user has asked why this context is set and I can't see a valid reason for it.

It might offer some context for React < v17 but it seems unlikely without sourcemaps.

[linear-code]

JS-2043

[bengineerdavis]

Affecting this internal ticket.