[dashboard] Add a notice of Prebuild GC to the prebuilds list

[filiptronicek]

Description

Adds our garbage collection policy for prebuilds as a notice in the organization prebuilds list

This is displayed at all times if the number of displayed prebuilds is > 1. This was done to reduce confusion when onboarding.

Related Issue(s)

Fixes CLC-838

How to test

1. Join my org
2. Take a gander at /prebuilds

[mustard-mh]

@filiptronicek It looks good when the list or prebuilds are fewer, but once prebuilds are used then the lists will not be fewer? And users will not aware of this message on the bottom of the list. Do you think we could have something marked in db that a prebuild is out-dated / deleted and show it? Or not necessary on current PR?

[filiptronicek]

@mustard-mh the thinking here is that if users are looking for a prebuild, they will naturally scroll down to find it. There, we'll educate them with this message. I don't think it's worth it to implement new APIs/change the current listPrebuilds just to have a warning somewhere.
Were you thinking about persisting all prebuilds forever in the DB, and when garbage collecting, just deleting their contents instead of also their DB entries?

[mustard-mh]

@mustard-mh the thinking here is that if users are looking for a prebuild, they will naturally scroll down to find it. There, we'll educate them with this message. I don't think it's worth it to implement new APIs/change the current listPrebuilds just to have a warning somewhere.

@filiptronicek Thanks, the explanation makes sense.

Were you thinking about persisting all prebuilds forever in the DB, and when garbage collecting, just deleting their contents instead of also their DB entries?

No, I was wrong.

[mustard-mh]

Code LGTM, I once checked preview and it looks good as well (but can't access it now with error ERR_TOO_MANY_REDIRECTS maybe relates to dev telepresence mode?)