ci: make any arch/ changes trigger kernel testing as well

This should fix issue like #54337 where architecture code changes were
filtering out kernel tests, where those changes are being tested. Kernel
and arch code is tightly coupled and we need to run kernel tests.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

scripts/ci/tags.yaml

@@ -56,6 +56,7 @@ cmsis_dsp:
 kernel:
   files:
     - kernel/
+    - arch/
 
 posix:
   files: