Build 10k test environment on Azure - Omnibus

As part of increasing test coverage, we should build out the rest of the reference architecture and provide ongoing GPT testing on AWS and Azure. This should be scheduled to run on Weekly basis.

RA doc: https://docs.gitlab.com/ee/administration/reference_architectures/#how-to-interpret-the-results