Revert "add tmt gating test plan after fixing gating.yaml"

This reverts commit 494ca5b568, as
it still breaks delivery. See also:

  https://issues.redhat.com/browse/RHELMISC-11324

Resolves: RHEL-84283

.fmf/version

@@ -1 +0,0 @@
-1

gating.yaml

@@ -4,4 +4,3 @@ product_versions:
 decision_context: osci_compose_gate
 rules:
   - !PassingTestCaseRule {test_case_name: kvm-ci.passt.x86_64.brew-build.gating.tier1.functional}
-  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

tier1-gating.fmf

@@ -1,9 +0,0 @@
-summary: Internal tests plan
-plan:
-  import:
-      url: https://gitlab.cee.redhat.com/libvirt-auto/libvirt-tmt-test.git
-      ref: master
-      name: /libvirt_tmt_test/plans/passt
-adjust:
-    enabled: false
-    when: distro == centos-stream or distro == fedora