[Enhancement] Make code more robust in case Jack-in task fails.

[cfehse]

The extension should behave more robust, if the Jack-in task fails either initially (e.g. the user selected an invalid project configuration like Leiningen + shadow-cljs if the project is only a Leiningen project) or the REPL process ends prematurely (e.g. a Leiningen project is only used for documentation generation and starting a REPL in the project will fail).
The extension should always return to a usable state - not leaving die UI in the connecting state with the nREPL button not usable.

[PEZ]

Agree! Maybe this too:

The user should be able to abort the jack-in process at any prompt by pressing ESC. Today, for some of the prompts, Calva doesn't ”listen” to that and just continues. With bad results, since it doesn't have the answer from the prompt.

If this should be in an issue of its own, let me know and I'll file a new issue instead.

[cfehse]

@PEZ

Good point! For the first step in the connection sequence I corrected this already. But I will take a look at the following steps as well.

[cfehse]

This is fixed in version 2.0.47.