Add m7g and r7g as ARM instance types

[TiberiuGC]

Description

Closes #6377

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[Himangini]

@TiberiuGC this is still in draft 😅
do we need to add tests for these new instance types?

[TiberiuGC]

@TiberiuGC this is still in draft 😅 do we need to add tests for these new instance types?

Yeah I forgot that if you open a draft PR once it defaults to draft for subsequent PRs 😓
Hmm, I don't see any of the IsXXXXInstanceType() functions having any tests. They are quite basic tho 🤔 Do you have any suggestions for where tests would be worth it?

[Himangini]

@TiberiuGC this is still in draft 😅 do we need to add tests for these new instance types?

Yeah I forgot that if you open a draft PR once it defaults to draft for subsequent PRs 😓 Hmm, I don't see any of the IsXXXXInstanceType() functions having any tests. They are quite basic tho 🤔 Do you have any suggestions for where tests would be worth it?

Nah, it's fine. 👍🏻