Show manifest julia version in status

[IanButterworth]

instantiate will warn if the julia version of the manifest is from a different minor release etc.

I think it would be helpful to also present the information in status and I'm thinking a field of status with a warn, rather than a full warning that only shows if it's different.

Also show even in non manifest status mode.

Something like:

(Foo) pkg> st
Status `~/Foo/Project.toml`
  [295af30f] Revise v3.6.2
  Manifest julia version v1.11.1 (potentially incompatible with this version)

But it's not quite right.