remove site health tests that aren't relevant to pantheon envs

inc/site-health.php

@@ -0,0 +1,28 @@
+<?php
+<?php
+/**
+ * Pantheon Site Health Modifications
+ *
+ * @package pantheon
+ */
+
+namespace Pantheon\Site_Health;
+
+// If on Pantheon...
+if ( isset( $_ENV['PANTHEON_ENVIRONMENT'] ) ) {
+	add_filter( 'site_status_tests', __NAMESPACE__ . '\\site_health_mods' );
+}
+
+/**
+ * Modify the Site Health tests.
+ *
+ * @param array $tests The Site Health tests.
+ * @return array
+ */
+function site_health_mods( $tests ) {
+	// Remove checks that aren't relevant to Pantheon environments.
+    unset( $tests['direct']['update_temp_backup_writable'] );
+    unset( $tests['direct']['available_updates_disk_space'] );
+    unset( $tests['async']['background_updates'] );
+	return $tests;
+}

pantheon.php

@@ -15,6 +15,7 @@
 if ( isset( $_ENV['PANTHEON_ENVIRONMENT'] ) ) {
 	require_once 'inc/functions.php';
 	require_once 'inc/pantheon-page-cache.php';
+	require_once 'inc/site-health.php';
 	if ( ! defined( 'DISABLE_PANTHEON_UPDATE_NOTICES' ) || ! DISABLE_PANTHEON_UPDATE_NOTICES ) {
 		require_once 'inc/pantheon-updates.php';
 	}