General: Continuing to work towards a passing PHP Compatibility scan.

This is a final pass to fix PHP compatibiilty issues in the codebase with code changes or adding `phpcs:ignore` comments.

With this change, all PHP compatibility warnings and errors without specific tickets have been addressed (see #49810 and #41750).

Props desrosj, johnbillion, jrf.
See #49922.
Built from https://develop.svn.wordpress.org/trunk@47902


git-svn-id: http://core.svn.wordpress.org/trunk@47676 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/cron.php

@@ -402,7 +402,7 @@ function wp_clear_scheduled_hook( $hook, $args = array() ) {
 	// Previously, this function took the arguments as discrete vars rather than an array like the rest of the API.
 	if ( ! is_array( $args ) ) {
 		_deprecated_argument( __FUNCTION__, '3.0.0', __( 'This argument has changed to an array to match the behavior of the other cron functions.' ) );
-		$args = array_slice( func_get_args(), 1 );
+		$args = array_slice( func_get_args(), 1 ); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
 	}
 
 	/**