function isFallThroughComment(comment, fallthroughCommentPattern) {
	return (
		fallthroughCommentPattern.test(comment) &&
		!directivesPattern.test(comment.trim())
	);
}
Checks whether or not a given comment string is really a fallthrough comment and not an ESLint directive.
@param {string} comment The comment string to check.
@param {RegExp} fallthroughCommentPattern The regular expression used for checking for fallthrough comments.
@returns {boolean} `true` if the comment string is truly a fallthrough comment.