Use variables expression to skip jobs when $RELEASE does not match
Description
This merge request optimizes GitLab QA pipeline by making it possible to avoid creating jobs when $RELEASE variables does not match the test.
In other words, we are not going to create EE jobs when someone wants to test CE and a trigger comes from a merge request, same for the CE.
Closes gitlab-org/gitlab-qa#133
Edited by George Koltsov