tests: bluetooth: Converted test to build_only

This is not a unit test, hence the build_only tag has been added

Signed-off-by: Kristoffer Rist Skøien <[email protected]>

Author: koffes

tests/bluetooth/iso/testcase.yaml

@@ -1,5 +1,6 @@
 tests:
   bluetooth.bis_and_acl:
+    build_only: true
     platform_allow: nrf5340dk_nrf5340_cpuapp nrf5340_audio_dk_nrf5340_cpuapp
     integration_platforms:
       - nrf5340dk_nrf5340_cpuapp