Autobuilder test/unsupported os: Promote to Windows and Linux test.

This way, we have at least one Windows test, which makes our internal testing easier.

Author: criemen

swift/ql/integration-tests/linux-only/autobuilder/unsupported-os/diagnostics.expected renamed to swift/ql/integration-tests/autobuilder/unsupported-os/diagnostics.expected

@@ -1,6 +1,6 @@
 import runs_on
 
 
-@runs_on.linux
+@(runs_on.linux or runs_on.windows)
 def test(codeql, swift):
     codeql.database.create(_assert_failure=True)