Update autoload path and plugin loading sequence in test bootstrap

This commit updates two main aspects in the test bootstrap file. Firstly, it modifies the path of the autoload file required for prophecy from using __DIR__ to using __FILE__. This change is done to ensure correct file path resolution in different environments.
Secondly, the loading sequence of the apple-news.php plugin has been changed. It is now loaded inside the BC_Setup initialization closure, guaranteeing its availability before the 'install' method execution. This adjustment ensures the correct plugin loading

tests/bootstrap.php

@@ -26,7 +26,7 @@ function apple_news_require_file( string $file ) {
 }
 
 // Autoloading for prophecy.
-apple_news_require_file( dirname( __DIR__ ) . '/vendor/autoload.php' );
+apple_news_require_file( dirname( dirname( __FILE__ ) ) . '/vendor/autoload.php' );
 
 /**
  * Install WordPress and load the plugin.
@@ -67,11 +67,11 @@ function () {
 			// Activate mocked Brightcove functionality.
 			$bc_setup = new BC_Setup();
 			$bc_setup->action_init();
-		}
-	)
-	// Load the plugin.
-	->install();
 
+			// Load the plugin.
+			require dirname( dirname( __FILE__ ) ) . '/apple-news.php';
+		}
+	)->install();
 
 // Disable CAP by default - make it opt-in in tests.
 tests_add_filter( 'apple_news_use_coauthors', '__return_false' );