ci: Less Windows CI for PRs (#26155)

Split Windows GHA CI job into `windows_clippy` and `windows_tests`
(`cargo test` and `cargo build`). `windows_clippy` will continue to run
on every PR commit, but `windows_tests` will only be run on main. Tag a
PR `windows` if you would like to run windows tests.

Added a call to the Azure metadata service to detect the Azure hardware
used by the GitHub hosted Windows runners. This is temporary and I'll
remove once I've gathered some data (adds 5-15secs to Windows CI times)

Release Notes:

- N/A

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Co-authored-by: Mikayla Maki <mikayla@zed.dev>