fix(release): allow a skipped windows smoke on the stable lane (#6480)

release-stable.yml offers win_x64_smoke_mode: skip, but choosing it makes the
release impossible to finish. The windows smoke uploads its e2e report with
if-no-files-found: warn, so a skipped smoke leaves the report directory empty
and publishes no artifact; finalize then downloads that artifact
unconditionally and fails — after every platform has already built, signed and
notarized, and after the pre-flight tag check has passed. Twenty-five minutes
of work is thrown away for a report nothing downstream reads.

Guard the download on the same condition that gates the smoke itself, matching
how the linux report is guarded by its build result. The mac report stays
unconditional because the mac smoke has no skip switch.

Author: lefarcen

.github/workflows/release-stable.yml

@@ -1261,7 +1261,15 @@ jobs:
           name: open-design-release-mac-e2e-report
           path: ${{ runner.temp }}/release-report/mac
 
+      # The windows smoke uploads this artifact with `if-no-files-found: warn`,
+      # so a skipped smoke leaves an empty report directory and publishes no
+      # artifact at all. Downloading it unconditionally then fails finalize —
+      # after all three platforms have already built, signed and notarized —
+      # which makes `win_x64_smoke_mode: skip` unusable on the stable lane even
+      # though the input offers it. Guard it the way the linux report is guarded
+      # by its own build result.
       - name: Download windows e2e spec report
+        if: ${{ inputs.win_x64_smoke_mode != 'skip' }}
         uses: actions/download-artifact@v8
         with:
           name: open-design-release-win-e2e-report