ci: Temporarily disable the buildkite job on Windows (#81538)

The failure rate is too high.
See
https://discourse.llvm.org/t/rfc-future-of-windows-pre-commit-ci/76840

Author: tstellar

.ci/generate-buildkite-pipeline-premerge

@@ -233,7 +233,10 @@ linux_projects=$(add-dependencies ${linux_projects_to_test} | sort | uniq)
 
 windows_projects_to_test=$(exclude-windows $(compute-projects-to-test ${modified_projects}))
 windows_check_targets=$(check-targets ${windows_projects_to_test} | sort | uniq)
-windows_projects=$(add-dependencies ${windows_projects_to_test} | sort | uniq)
+# Temporary disable the windows job.
+# See https://discourse.llvm.org/t/rfc-future-of-windows-pre-commit-ci/76840
+#windows_projects=$(add-dependencies ${windows_projects_to_test} | sort | uniq)
+windows_projects=""
 
 # Generate the appropriate pipeline
 if [[ "${linux_projects}" != "" ]]; then