* Add support to create a job by copy mode

* Add more test cases

* Add args valid method

* Fix the test failed

* Cleanup the unnecessary code lines

* Add artifact client

* Add the cmd of job artifact list

* Add test cases for job artifact cmd

* Allow http downloader can set the proxy

* Add artifact download cmd

* Try to fix the quality gate error

* Add test cases for artifact download

* Add test cases for http proxy