Remove gating config

Gating in rawhide is fragile and unreliable and usually
causes more troubles than adds value. Moreover, using CI
and pull-request based process for updates with a rebuild
of dependant packages is more than enough to uncover
a possible issues.

gating.yaml

@@ -1,7 +0,0 @@
---- !Policy
-product_versions:
-  - fedora-*
-decision_context: bodhi_update_push_stable
-subject_type: koji_build
-rules:
-  - !PassingTestCaseRule {test_case_name: fedora-ci.koji-build.tier0.functional}