Add gitlab upgrade test jobs
What does this MR do and why?
Describe in detail what your merge request does and why.
Implements support for testing update from a previous major/minor/patch version of gitlab
Part of: gitlab-qa#672 (closed)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Andrejs Cunskis