Clean up the workaround for only rendering the AudienceErrorModal once within the AudienceTilesWidget

[techanvil]

Feature Description

Issue #9495 introduced a temporary workaround to ensure AudienceErrorModal is only rendered once within AudienceTilesWidget.

This is a bit hackish and should be refactored so we only render the AudienceErrorModal at the level of the AudienceTiles component rather than conditionally within AudienceTilePagesMetric.

site-kit-wp/assets/js/modules/analytics-4/components/audience-segmentation/dashboard/AudienceTilesWidget/AudienceTile/AudienceTilePagesMetric.js

Lines 233 to 243 in 78747fb

	{ /*
	TODO: The `audienceTileNumber` check is part of a temporary workaround to ensure `AudienceErrorModal` is only rendered once
	within `AudienceTilesWidget`. This should be removed, and the `AudienceErrorModal` render extracted
	from here to be rendered once at a higher level instead. See https://github.com/google/site-kit-wp/issues/9543.
	*/ }
	{ audienceTileNumber === 0 &&
	( ( customDimensionError && ! isSaving ) ||
	( isRetryingCustomDimensionCreate &&
	! isAutoCreatingCustomDimensionsForAudience ) ||
	hasOAuthError ) && (
	<AudienceErrorModal

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