MQE-2669: bin/mftf run:failed process used a lot of RAM during MTSv1 build

Author: okolesnyk

src/Magento/FunctionalTestingFramework/Console/GenerateTestFailedCommand.php

@@ -75,6 +75,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
         if ($testConfiguration === null) {
             // No failed tests found, no tests generated
+            $this->removeGeneratedDirectory($output, $verbose);
             return 0;
         }
 

src/Magento/FunctionalTestingFramework/Console/RunTestFailedCommand.php

@@ -68,6 +68,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             "testManifest.txt";
 
         $testManifestList = $this->readTestManifestFile();
+        if ($testManifestList === false) {
+            // If there is no test manifest file then we have nothing to execute.
+            return 0;
+        }
         $returnCode = 0;
         for ($i = 0; $i < count($testManifestList); $i++) {
             if ($this->pauseEnabled()) {
@@ -150,7 +154,10 @@ function ($type, $buffer) use ($output) {
      */
     private function readTestManifestFile()
     {
-        return file($this->testsManifestFile, FILE_IGNORE_NEW_LINES);
+        if (file_exists($this->testsManifestFile)) {
+            return file($this->testsManifestFile, FILE_IGNORE_NEW_LINES);
+        }
+        return false;
     }
 
     /**