Add php_runtime_generation field to env:list command output

- Add php_runtime_generation field label to env:list command
- Add test coverage for php_runtime_generation field in env:list
- Fix indentation in Environment.php getPHPRuntimeGeneration method

Resolves #2720

Author: pwtyler

src/Commands/Env/ListCommand.php

@@ -34,6 +34,7 @@ class ListCommand extends TerminusCommand implements SiteAwareInterface
      *     connection_mode: Connection Mode
      *     locked: Locked
      *     initialized: Initialized
+     *     php_runtime_generation: PHP Runtime Generation
      * @return RowsOfFields
      *
      * @param string $site_id Site name

src/Models/Environment.php

@@ -690,7 +690,7 @@ public function getPHPVersion()
      */
     public function getPHPRuntimeGeneration()
     {
-         return $this->settings('appserver_runtime')->php_runtime_generation;
+        return $this->settings('appserver_runtime')->php_runtime_generation;
     }
 
     /**

tests/Functional/EnvCommandsTest.php

@@ -455,6 +455,11 @@ public function testListCommand()
             $env,
             'An environment should have "initialized" field.'
         );
+        $this->assertArrayHasKey(
+            'php_runtime_generation',
+            $env,
+            'An environment should have "php_runtime_generation" field.'
+        );
     }
 
     /**