Merge #11053

11053: feat: Publish platform-specific Code VSIXes r=me a=lnicola

Closes #10483
CC #10371

Some notes:

 - we still build a plain VSIX, just in case
 - we build the extension on every platform to make the release workflow arguably cleaner
 - the Windows VSIX includes the PDB (but let's leave  #10371 open until we change the Windows stand-alone release to a ZIP file)
 - `npm` doesn't run if started from `xtask`, possibly something related to path mapping; I moved the `npm` calls outside, but..
 - the `Patch` thingy doesn't work any more, so you'll end up with a dirty `package.json` of you run `cargo xtask --client-patch-version`; I don't think we should block on this
 - there's an untested Alpine build; for better or worse, we special-case `musl` distros as `alpine`
 - I tested this as much as I could, but not the publishing and nightly updates
 - you can find some sample artifacts under https://github.com/lnicola/rust-analyzer/releases
 - we can now run the server from the install location (is Code planning to switch to compressed extensions?), except on NixOS
 - Code lets you install a VSIX for the wrong platform (with the results one would expect)
 - I don't know what happens if we try to publish a VSIX without a target

This is a relatively risky, but we'll probably have to take our chances with it.

r? `@rust-analyzer/review`

Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>

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