Onboard M7a as a supported instance

[JackThomson2]

Description

Onboard the M7a 4th Generation AMD EPYC as a new instance in our CI for testing.

This will add the instance to our testing platforms and run CI testing against this on Buildkite PR steps and the performance A/B tests

Acceptance Criteria

• CI passes
• Fix failing tests new instance

[hpvd]

just for understanding:
is this about adding a non bare metal instance?

if so, how do one deal with the circumstance described below:

What are the possibilities to do so without having to rely on daxx expensive aws bare metal instances?
Of course there are some cheap, virtualized offers which should make nested kvm possible -at the first sight.
-> but as far as I know this is not suitable for longer running production use cases because these instances could be auto-live-migrated at anytime which will break the instance....

see #4950

[JackThomson2]

Officially onboarded in this PR: #5088