Merge branch 'bugfix/fix_ci_example_test_not_executed' into 'master'

ci: init submodule in assign_test job

See merge request idf/esp-idf!4046

.gitlab-ci.yml

@@ -798,7 +798,6 @@ assign_test:
       - $BOT_LABEL_UNIT_TEST
       - $BOT_LABEL_INTEGRATION_TEST
       - $BOT_LABEL_EXAMPLE_TEST
-  before_script: *add_gitlab_key_before
   script:
     # assign example tests
     - python $TEST_FW_PATH/CIAssignExampleTest.py $IDF_PATH/examples $IDF_PATH/.gitlab-ci.yml $EXAMPLE_CONFIG_OUTPUT_PATH