Add create and edit functionality to anti-affinity groups

[charliepark]

This PR adds some functionality to anti-affinity groups, mainly in the "adding and removing instances" vein. Also, editing an anti-affinity group's name and description.

Once this PR is merged, the following items from #2771 will be functional.

• create anti-affinity group button and modal
• add member instance to anti-affinity group
  • from group page
  • ❌ from instance's Settings tab
• remove instance from anti-affinity group
  • from group page
  • ❌ from instance's Settings tab
• edit group (name, description)

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Name	Status	Preview	Updated (UTC)
console	✅ Ready (Inspect)	Visit Preview	Apr 7, 2025 9:20pm

[david-crespo]

Type -> group type in column header + dropped description column. We tend to only put the description in when we don't have enough other columns. I feel it's a lot more manageable now somehow. Ben approved.

I'm still not satisfied with the copy about policy in the popover, the policy tooltip, and the policy field on the form — will be poking at it a bit more today.

[david-crespo]

Actually going with this. I was worried that it wasn't clear enough when you get to the page (or even before, since the sidebar is affected too) that what we're talking about is groups. "New group" in the button wasn't enough for me.

[david-crespo]

Feels a little silly to have three slightly different ways of putting it, but on the other hand that might actually help.

[david-crespo]

yeehaw

yeehaw.mp4