Validate GitLab QA selectors

Grzegorz Bizonrequested to merge
qa/gb/validate-qa-selectors into master

What does this MR do?

This merge request is an attempt to add GitLab QA selectors' validation to CE and EE to avoid fragile tests.

What are the relevant issue numbers?

Closes gitlab-qa#58 (closed)

Edited by Grzegorz Bizon

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