Allow search in UI for interpreter selection

[juliasilge]

When we make some improvements to the interpreter selection UI, we should add the ability to search the runtimes/interpreters:

It's really normal to have ONE ZILLION options here for Python, so better UI would be great. cc @chendaniely

The quick pick that "Python: Select Interpreter" uses feels like a better fit for this task:

[petetronic]

Could we consider removing the "select alternate runtime version for a language" capability of the top bar interpreter control, and instead leave that to our quick pick option? The existing top bar control could just remain focused on active sessions?

[jmcphers]

I like that idea. We probably still want some gesture for "choose a different version of this language" from the TBID, but it could open the quickpick (or perhaps a dedicated modal with its own search) when invoked.

[DavisVaughan]

Also heavily related to #2235

Note that the Python quick pick has Enter interpreter path... for when autodiscovery fails.

We've already had a few R reports where auto discovery failed because R is in a non standard place, and we need a way for people to be able to supply their own path to R or folder to look in.

[liquidcarbon]

zoomed in:

Not sure how to pick an interpreter in the 2024.6.27 release (Ubuntu 24.04).

Getting this error when trying to browse for an interpreter. The only one available under "start interpreter" is the global one that I don't want to use.

[seeM]

@liquidcarbon thanks for the report! I've replied in #3710.