buck2/github: use drive D on Windows

Summary:
Drive C is known to be significantly slower on Github Windows runners: actions/runner-images#8755

Use drive D for Cargo and Rustup.

* `build_debug` **hg 23m34s** -> **20m25s**
* `build_release` **28m5s** -> **22m56s**

Differential Revision: D66011457

.github/actions/setup_windows_env/action.yml

@@ -3,6 +3,16 @@ description: Setup Windows environment for building and testing
 runs:
   using: composite
   steps:
+  - name: Configure Cargo and Rustup to use drive D
+    run: |
+      New-Item -ItemType Directory -Path D:\rustup
+      New-Item -ItemType Directory -Path D:\cargo
+      New-Item -ItemType Directory -Path D:\temp
+      "RUSTUP_HOME=D:\rustup" | Out-File -FilePath $env:GITHUB_ENV -Append
+      "CARGO_HOME=D:\cargo" | Out-File -FilePath $env:GITHUB_ENV -Append
+      "TEMP=D:\temp" | Out-File -FilePath $env:GITHUB_ENV -Append
+      "TMP=D:\temp" | Out-File -FilePath $env:GITHUB_ENV -Append
+      "D:\cargo\bin" | Out-File -FilePath $env:GITHUB_PATH -Append
     shell: pwsh
   - name: Write Visual Studio path
     run: |-