[CI:DOCS] Skip windows-smoke when not useful

It's important to actually perform a windows build for a `[CI:DOCS]` PR
since it verifies and includes a copy of the docs.  However, it's not
necessary to actually test if the installer functions or not. That task
should happen in other contexts.

Signed-off-by: Chris Evich <cevich@redhat.com>

.cirrus.yml

@@ -524,8 +524,13 @@ compose_test_task:
 windows_smoke_test_task:
     name: "Windows Smoke Test"
     alias: windows_smoke_test
-    # Don't run for multiarch/container image cirrus-cron job.
-    only_if: $CIRRUS_CRON != 'multiarch'
+    # Only run for non-docs/copr PRs and non-multiarch branch builds
+    # and never for tags.  Docs: ./contrib/cirrus/CIModes.md
+    only_if: >-
+        $CIRRUS_TAG == '' &&
+        $CIRRUS_CRON != 'multiarch' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:DOCS.*' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:COPR.*'
     depends_on:
       - alt_build
     ec2_instance: