Tests: Restore the Abilities API setup filter stack.

Use `try`/`finally` around core ability and category registration so each simulated action is removed from `$wp_current_filter` even if registration throws.

Follow-up to [64266].

Developed in: #14296

Props shailu25.
See #65893.


git-svn-id: https://develop.svn.wordpress.org/trunk@64362 602fd350-edb4-49c9-b593-d223f7449a82

Author: lancewillett

tests/phpunit/tests/abilities-api/wpRegisterCoreAbilities.php

@@ -23,13 +23,20 @@ public static function set_up_before_class(): void {
 		global $wp_current_filter;
 
 		// Ensure core abilities and categories are registered for these tests.
+		// Pop in finally so a setup exception cannot leave the simulated action on the stack.
 		$wp_current_filter[] = 'wp_abilities_api_categories_init';
-		wp_register_core_ability_categories();
-		array_pop( $wp_current_filter );
+		try {
+			wp_register_core_ability_categories();
+		} finally {
+			array_pop( $wp_current_filter );
+		}
 
 		$wp_current_filter[] = 'wp_abilities_api_init';
-		wp_register_core_abilities();
-		array_pop( $wp_current_filter );
+		try {
+			wp_register_core_abilities();
+		} finally {
+			array_pop( $wp_current_filter );
+		}
 	}
 
 	/**