gitlab-ci: reduce connected10 from error to warning

connected10 is still flaky since the emulator crashes a lot.  Marking it
for "allow_failure" will still show a warning, but it won't fail the build.

.gitlab-ci.yml

@@ -46,6 +46,7 @@ connected10:
     # this file changes every time but should not be cached
     - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
     - exit $EXITVALUE
+  allow_failure: true
 
 connected24:
   variables: