ci: manage when to build testsuite tests

Do not build test framework tests on every change, use tag filtering to
improve CI performance.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

scripts/ci/tags.yaml

@@ -46,6 +46,10 @@ bluetooth:
     - subsys/bluetooth/
     - subsys/net/l2/bluetooth/
 
+testsuite:
+  files:
+    - subsys/testsuite/
+
 cmsis_dsp:
   files:
     - modules/Kconfig.cmsis_dsp