Tests: Fix REST schema and multisite test failures

Restore the `wp_client_side_media_processing_enabled` filter and the
`finalize` route that were accidentally removed from the REST schema
test. Add the `collaboration` table to the list of tables expected to
be empty after multisite site creation.

Author: josephfusco

tests/phpunit/tests/multisite/site.php

@@ -179,7 +179,7 @@ public function test_created_site_details() {
 			// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 			$result = $wpdb->get_results( "SELECT * FROM $prefix$table LIMIT 1" );
 
-			if ( 'commentmeta' === $table || 'termmeta' === $table || 'links' === $table ) {
+			if ( 'commentmeta' === $table || 'termmeta' === $table || 'links' === $table || 'collaboration' === $table ) {
 				$this->assertEmpty( $result );
 			} else {
 				$this->assertNotEmpty( $result );

tests/phpunit/tests/rest-api/rest-schema-setup.php

@@ -16,6 +16,9 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 	public function set_up() {
 		parent::set_up();
 
+		// Ensure client-side media processing is enabled so the sideload route is registered.
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
+
 		// Ensure collaboration routes are registered.
 		add_filter( 'pre_option_wp_enable_real_time_collaboration', '__return_true' );
 
@@ -113,6 +116,7 @@ public function test_expected_routes_in_schema() {
 			'/wp/v2/media/(?P<id>[\\d]+)/post-process',
 			'/wp/v2/media/(?P<id>[\\d]+)/edit',
 			'/wp/v2/media/(?P<id>[\\d]+)/sideload',
+			'/wp/v2/media/(?P<id>[\\d]+)/finalize',
 			'/wp/v2/blocks',
 			'/wp/v2/blocks/(?P<id>[\d]+)',
 			'/wp/v2/blocks/(?P<id>[\d]+)/autosaves',