[Feature Request]: Expand $(~) to $(HOME) or $(USERPROFILE) depending on OS

### Summary

Currently, you need to do something like the following to consistently get the `~` home directory in a cross-platform way:

```xml

$(HOME)
$(USERPROFILE)

```

It would be awesome if the well-known shorthand `~` (even PowerShell Core knows it) could be used directly in MSBuild as a built-in envvar alias for either `$(HOME)` or `$(USERPROFILE)` depending on the current OS, just like `pwsh` does it.

### Background and Motivation

No particular problem, just a desire for more consistency across developer tooling in the ecosystem (following the lead from `pwsh`).

### Proposed Feature

Summary contains the proposal, which would be to consider `~` as an alias to either `Home` or `UserProfile` envvar names in Unix-like vs Windows.

### Alternative Designs

_No response_