Test placement (#21801)

* Fix test placement and update messaging.
* Add note about group selection.

test/sanity/code-smell/integration-aliases.py

@@ -46,12 +46,20 @@ def main():
 
         %s
 
-        Unless a test cannot run as part of CI, you'll want to add an appropriate CI alias, such as:
+        If these tests cannot be run as part of CI (requires external services, unsupported dependencies, etc.),
+        then they most likely belong in `test/integration/roles/` instead of `test/integration/targets/`.
+        In that case, do not add an `aliases` file. Instead, just relocate the tests.
+
+        However, if you think that the tests should be able to be supported by CI, please discuss test
+        organization with @mattclay or @gundalow on GitHub or #ansible-devel on IRC.
+
+        If these tests can be run as part of CI, you'll need to add an appropriate CI alias, such as:
 
         posix/ci/group1
         windows/ci/group2
 
         The CI groups are used to balance tests across multiple jobs to minimize test run time.
+        Using the relevant `group1` entry is fine in most cases. Groups can be changed later to redistribute tests.
 
         Aliases can also be used to express test requirements: