Add user home variable

[Bruce-Hopkins]

This PR fixes #141657

[ghost]

All CLA requirements met.

[alexr00]

It looks like this change requires knowledge of where the code is running (extension host vs. renderer vs. other processes). I am working on a commit.

I've added the paths to the contructors, now it seems I need to implement the service in instantiationService.ts.

Also, it seems I need to initiate the service in this line. I don't know what method I would do this:

vscode/src/vs/server/node/serverServices.ts

Line 190 in eb0935b

socketServer.registerChannel(REMOTE_TERMINAL_CHANNEL_NAME, new RemoteTerminalChannel(environmentService, logService, ptyService, productService));

We should probably move ExtHostVariableResolverService, which I will do. This releates to knowing which process the code will be running in.

[alexr00]

@Bruce-Hopkins I have made some changes:

• In places where we're running in a process that can use node (the extension host and the terminal channel process) I have added calls to get the user home with node API.
• In places where we're not, I use the path service.

I will test it next week and plan to merge then.

[Bruce-Hopkins]

@alexr00 Thanks. So far it seems to work on my machine.

I appreciate the help with this PR.

[alexr00]

Looks good, thank you for the PR!