refactor: use the new black friday hooks

[Soare-Robert-Daniel]

Summary

• Removed the old code for Black Friday.
• Added the new hooks integration.

Will affect visual aspect of the product

YES

Screenshots

Test instructions

• USE THIS SDK VERSION as PLUGIN
• Alter the date to fall into the Black Friday sales period.

You can use this hook to alternate it:

add_filter(
	'themeisle_sdk_current_date',
	function() {
		return new DateTime( '2025-11-26' );
	}
);

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 #.