Bootstrap GnuPG and file on Windows (#41810)

Spack can now bootstrap two new dependencies on Windows: GnuPG, and file. 

These dependencies are modeled as a separate package, and they install a cross-compiled binary.
Details on how they binaries are built are in https://github.com/spack/windows-bootstrap-resources

share/spack/gitlab/cloud_pipelines/.gitlab-ci.yml

@@ -218,7 +218,7 @@ default:
     - $ErrorActionPreference=$ErrorActionOld
 
   tags: ["spack", "public", "medium", "x86_64-win"]
-  image: "ghcr.io/johnwparent/windows-server21h2:sha-c749cf3"
+  image: "ghcr.io/johnwparent/windows-server21h2:sha-1c12b61"
 
 .generate-deprecated:
   extends: [ ".base-job" ]

share/spack/gitlab/cloud_pipelines/configs/win64/ci.yaml

@@ -15,4 +15,4 @@ ci:
       - spack.ps1 config add "config:install_tree:projections:${SPACK_JOB_SPEC_PKG_NAME}:'morepadding/{hash}'"
       - mkdir ${SPACK_ARTIFACTS_ROOT}/user_data
       - spack.ps1 --backtrace ci rebuild | Tee-Object -FilePath "${env:SPACK_ARTIFACTS_ROOT}/user_data/pipeline_out.txt" 2>&1 | Tee-Object -FilePath "${env:SPACK_ARTIFACTS_ROOT}/user_data/pipeline_err.txt"
-      image: "ghcr.io/johnwparent/windows-server21h2:sha-c749cf3"
+      image: "ghcr.io/johnwparent/windows-server21h2:sha-1c12b61"

share/spack/qa/bootstrap-file.py

@@ -0,0 +1,4 @@
+from spack.util.filesystem import file_command
+
+if __name__ == "__main__":
+    file_command()