fix: set loading/success when erroring in useLoadScript

[davidjb]

When trying to use errorElement to display an error message when the Google Charts API doesn't load, I found that isLoading never goes to false, which means that the below only renders props.loader and can never render props.errorElement:

react-google-charts/packages/react-google-charts/src/Chart.tsx

Lines 11 to 18 in 27d1ba8

	const ChartView: React.FC<ReactGoogleChartProps> = (props) => {
	const { google, isLoading, error } = useLoadGoogleCharts(props);
	if (isLoading) {
	return props.loader ?? null;
	}
	if (error) {
	return props.errorElement ?? null;
	}

This PR solves the issue by calling setIsLoading(false); after setError(error);, and centralises this logic into a onError(error) handler, which consistently sets all three states for loading, error and success. Equally, onLoad has been adjusted slightly to clear an existing error if set -- such as when retrying or with a changed src.

Tests have been added to ensure that errorElement renders; these would have failed without the changes in this PR.

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