Rework of the gating configuration (PTG-643)

ci.fmf

@@ -0,0 +1,18 @@
+---
+resultsdb-testcase: separate
+
+/gating/public:
+  plan:
+    import:
+      name: /plans/gating
+      url: https://gitlab.com/redhat/centos-stream/tests/pcp.git
+
+/gating/private:
+  enabled: false
+  adjust:
+    - when: distro == rhel
+      enabled: true
+  plan:
+    import:
+      name: /plans/gating
+      url: https://gitlab.cee.redhat.com/toolchain-qe/tests/pcp.git

gating.yaml

@@ -1,6 +1,6 @@
 --- !Policy
 product_versions:
-  - rhel-8
+  - rhel-*
 decision_context: osci_compose_gate
 rules:
-  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.tier1.functional}
+  - !PassingTestCaseRule {test_case_name: osci.brew-build./gating.functional}