Impovements in FE e2e script

It could happen that npm script for runing test can hang
and hence some resources may not be freed properly.
This patch adds timeout for npm script and make sure that
process will be killed.

Change-Id: I0694ff71aad885564ae0591ec003722babd235a4

Author: mbodzek

gui/frontend/src/tests/e2e/setup_local_env_and_run.py

@@ -88,6 +88,8 @@
 MAX_WORKERS = "3"
 TOKEN = "1234test"
 
+TESTS_TIMEOUT = 30*60
+
 class SetEnvironmentVariablesTask:
     """Task for setting environment variables"""
 
@@ -157,7 +159,13 @@ def run(self) -> None:
 
         e2e_tests = subprocess.Popen(args=args, env=self.environment)
         e2e_tests.communicate()
-        return_code = e2e_tests.wait()
+
+        try:
+            return_code = e2e_tests.wait(timeout=TESTS_TIMEOUT)
+        except subprocess.TimeoutExpired:
+            e2e_tests.kill()
+            return_code = -1
+
         if return_code != 0:
             raise task_utils.TaskFailException("Tests failed")