Inform about conflict with the Clojure extension

[PEZ]

It is not uncommon for VS Code clojurians to try some different extension, among them Calva. It is probably extra common to try the Clojure extension early. However as #1426 shows, it overlaps with a lot of what Calva provides, and it is not clear to users that they might be using the nREPL services from there, rather than from Calva. Which creates confusion in a lot of ways.

We should consider to issue a warning when we see that the Clojure extension is active while Calva's nREPL services are enabled.

There is also Clover, but the overlap is much smaller and I think it is often a much more deliberate decision to use its REPL instead of Calva's.

[bpringe]

I think the intention was for this to be closed. Reopen if I'm mistaken.

[PEZ]

We haven't released the fix yet, have we?

[bpringe]

My mistake