Copy improvements for Cluster create view

From #22392 (comment 225845219):

  • ... in an easy way. Is there an alternative that's harder, or is this the only way? If:
    • There's an alternative harder way, perhaps say ... you can easily use review apps... and end with ... much more.
    • This is the only way, perhaps say Associating a Kubernetes cluster to this project enables you to use review apps...
  • Create cluster on => Create new cluster on.
  • Add existing cluster => Use existing cluster. Might be out of scope, but to me we are either "Adding a Kubernetes integration by creating a new cluster" or "adding a Kubernetes integration by using an existing cluster". It's a bit of a nitpick. Else, we could be "adding a Kubernetes integration by adding a new cluster" and "adding a Kubernetes integration by adding an existing cluster".

cc @eread

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