feat: add filter for Scroll to Top display

[HardeepAsrani]

Summary

Adds neve_scroll_to_top_is_enabledfilter to the plugin that allows users to control Scroll to Top display.

Important: The PR is made against #4445

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• Try some condition like:

add_action( 'init', function() {
	/**
	 * Filter scroll to top to only show on pages, not archives or posts.
	 */
	add_filter(
		'neve_scroll_to_top_is_enabled',
		function( $is_enabled ) {
			// Only enable on pages, disable on archives, posts, and other content types
			if ( ! is_page() ) {
				return false;
			}
			return $is_enabled;
		}
	);
} );

And make sure it works properly.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/neve-pro-addon/issues/2582.

[pirate-bot]

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