Adjust Azure Ref Arch recommendations to 1k and 2k sizings only

What does this MR do?

MR adjusts our Azure Reference Architecture recommendations to only be on smaller setups (up to 2k).

After discussions with various stakeholders, including Alliances, it was agreed this was the best way forward at this time due to various performance issues found on the cloud providers services at larger scales. This ensures we set up customers to succeed but also keeps the door open to consume any performance improvements made on Azure's end.

Related issues

Closes https://gitlab.com/gitlab-org/quality/reference-architectures/-/issues/162

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