[CI] Skip MSVC when building R package (#9995)

* [CI] Skip MSVC when building R package

* [CI] Stop building binary tarball for Windows

* Remove unused script

tests/buildkite/build-rpkg-win64-gpu.ps1

@@ -1,21 +0,0 @@
-$ErrorActionPreference = "Stop"
-
-. tests/buildkite/conftest.ps1
-
-Write-Host "--- Build XGBoost R package with CUDA"
-
-nvcc --version
-$arch_flag = "-DGPU_COMPUTE_VER=75"
-
-bash tests/ci_build/build_r_pkg_with_cuda_win64.sh $Env:BUILDKITE_COMMIT
-if ($LASTEXITCODE -ne 0) { throw "Last command failed" }
-
-if ( $is_release_branch -eq 1 ) {
-  Write-Host "--- Upload R tarball"
-  Get-ChildItem . -Filter xgboost_r_gpu_win64_*.tar.gz |
-  Foreach-Object {
-    & aws s3 cp $_ s3://xgboost-nightly-builds/$Env:BUILDKITE_BRANCH/ `
-    --acl public-read --no-progress
-    if ($LASTEXITCODE -ne 0) { throw "Last command failed" }
-  }
-}

tests/buildkite/pipeline-win64.yml

@@ -13,11 +13,6 @@ steps:
     key: build-win64-gpu
     agents:
       queue: windows-cpu
-  - label: ":windows: Build XGBoost R package for Windows with CUDA"
-    command: "tests/buildkite/build-rpkg-win64-gpu.ps1"
-    key: build-rpkg-win64-gpu
-    agents:
-      queue: windows-cpu
 
   - wait