fix(core): User is allowed to create nonsensical clusters

[mathieu-anderson]

What happened?

There seems to be no validation either in the FE or the BE regarding creation of clusters. This allows users to create nonsensical clusters:

Screen.Recording.2024-02-12.at.09.58.20.mov

However, the biger issue is that users are allowed to create clusters that mostly make sense, but will not work as intended because of a subtle typo or other hard to see issue.

What did you expect to happen?

• Validation on the front end for superficial errors (typo, formatting ?)
• Validation on the backend for validity of the cluster that was added (tring to ping it, or a health check, or something?)

The FE fixes may be only implemented on the coral side (#2280), as we may not want to invest too much in the Angular app at this point.