[v9] Fix React Error Boundary typing for `componentStack`

[AbhiPrasad]

Description

sentry-javascript/packages/react/src/errorboundary.tsx

Lines 101 to 102 in 5b77377

	// TODO(v9): Remove this check and type `componentStack` to be React.ErrorInfo['componentStack'].
	const passedInComponentStack: string | undefined = componentStack == null ? undefined : componentStack;

[kunal-511]

@AbhiPrasad I have raised PR for this issue. Please have a look: #14327

[andreiborza]

hey @kunal-511 thanks for contributing this. We'll take a look.

[AbhiPrasad]

This can only be merged in once v9 is being actively worked on.