Restart language server if interpreter path of selected environment changes

[karrtikr]

Now that we support conda environments without python, installing python into those environments should result in restart of language servers as the python that is being used by the env changes. We can use

vscode-python/src/client/interpreter/display/index.ts

Line 52 in 787fa5a

this.interpreterService.onDidChangeInterpreterInformation(

to check if interpreter path changes, or fire an event after

vscode-python/src/client/interpreter/interpreterService.ts

Line 200 in f1d0509

private async ensureEnvironmentContainsPython(pythonPath: string) {

finishes execution.

Related: #18964

[TylerLeonhardt]

What would be some good verification steps for this?

[kimadeline]

Let me know if the following works:

Pre-reqs:

• Have Conda installed

Steps:

1. Create a conda environment using the -n argument (will create a named conda environment without Python): conda create -n test1
2. Open a folder with a Python file, activate the extension
3. Make sure you have a language server running (look for Starting Pylance language server or Starting Jedi language server in the Python output channel)
4. Open the interpreter selection quickpick and select the test1 environment, you may need to refresh the list of environments using the refresh button in the quickpick
5. Make sure that the following message appears in the status bar:
   
6. There should be an interpreter refresh in the status bar once installation has finished, and once the refresh is done check that the Python output channel has multiple Starting [Pylance|Jedi] language server messages