1. test will be categorized by test level
2. add test level as attribute to test cases
3. will select TestCaseScript by the test cases added to CI (currently no test case uses test case script)
4. adding test level to test jobs
5. update .gitlab-ci.yml, each job need to set its test case file path
6. update .gitlab-ci.yml, test case path for test report is changed to idf_test
