Display and updated in process documents in PDF document data metabox

[MohamadNateqi]

close #756

This PR improves the way document data are displayed in the metabox. It includes a check for pending jobs and displays a message if the document is still in the queue. It also adds an AJAX request that refreshes document data, eliminating the need to refresh the page.

Note: For the Pro extension compatibility, this branch should be used: https://github.com/wpovernight/woocommerce-pdf-ips-pro/pull/407

---

For test purposes, the below snippet can be used to stop the queue from running jobs:

function wpo_disable_default_runner() {
	if ( class_exists( 'ActionScheduler' ) ) {
		remove_action( 'action_scheduler_run_queue', array( ActionScheduler::runner(), 'run' ) );
	}
}

add_action( 'init', 'wpo_disable_default_runner', 10 );

Then, the job can be manually run to test the AJAX update.

[alexmigf]

@MohamadNateqi can you fix the conflicts?

[MohamadNateqi]

@alexmigf Done.

[alexmigf]

LGTM!

[alexmigf]

@MohamadNateqi can you fix the conflicts please?