PostScheduleLabel: Updated the component to return a translatable string for postpublish component.

[CoderAbhinav]

Description:

1. Added a prop to return a proper translatable string for post publish panel.
2. This doesn't affect any existing usage of the component.

What?

As mentioned in the #67487 issue, we need to break the string mentioned here

gutenberg/packages/editor/src/components/post-schedule/label.js

Lines 60 to 95 in 7e9e53d

	export function getPostScheduleLabel(
	dateAttribute,
	{ isFloating = false, now = new Date() } = {}
	) {
	if ( ! dateAttribute || isFloating ) {
	return __( 'Immediately' );
	}
	// If the user timezone does not equal the site timezone then using words
	// like 'tomorrow' is confusing, so show the full date.
	if ( ! isTimezoneSameAsSiteTimezone( now ) ) {
	return getFullPostScheduleLabel( dateAttribute );
	}
	const date = getDate( dateAttribute );
	if ( isSameDay( date, now ) ) {
	return sprintf(
	// translators: %s: Time of day the post is scheduled for.
	__( 'Today at %s' ),
	// translators: If using a space between 'g:i' and 'a', use a non-breaking space.
	dateI18n( _x( 'g:i\xa0a', 'post schedule time format' ), date )
	);
	}
	const tomorrow = new Date( now );
	tomorrow.setDate( tomorrow.getDate() + 1 );
	if ( isSameDay( date, tomorrow ) ) {
	return sprintf(
	// translators: %s: Time of day the post is scheduled for.
	__( 'Tomorrow at %s' ),
	// translators: If using a space between 'g:i' and 'a', use a non-breaking space.
	dateI18n( _x( 'g:i\xa0a', 'post schedule time format' ), date )
	);
	}

Such that translators can easily translate the string.
So I have updated the usePostScheduleLabel with a prop for which will be used to identify where we are using this, so that if it's used in the Post Publish Panel, it will return an output which says "It will go live on %s", this allows the translators to translate the string for most of the langugages, providing them better context.

Why?

This was mentioned in the following issue #67487 and also suggested to break the string so it will be easy for translations.

How?

Basically we have broken down the initial string such that now it will be returning a full label with string for the provided post publish panel, while it will work normally for the rest of the instances.

Testing Instructions

1. Go to Posts > Add New
2. Write a new post
3. Schedule it to be published tomorrow
4. See the post-publish panel.

Testing Instructions for Keyboard

Screenshots or screencast

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Co-authored-by: CoderAbhinav <[email protected]>

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[github-actions]

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