Enable gating on tmt plan

Resolves: rhbz#2159303

.fmf/version

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

gating.yaml

@@ -0,0 +1,7 @@
+--- !Policy
+
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

plan.fmf

@@ -0,0 +1,10 @@
+execute:
+    how: tmt
+
+environment:
+    X: test_decimal
+
+discover:
+    how: fmf
+    url: https://src.fedoraproject.org/tests/python.git
+    test: /selftest/parallel

tests/tests_python.yml

@@ -1,17 +0,0 @@
----
-- hosts: localhost
-  roles:
-  - role: standard-test-basic
-    tags:
-    - classic
-    repositories:
-    - repo: "https://src.fedoraproject.org/tests/python.git"
-      dest: "python"
-    tests:
-    - python_selftest:
-        dir: python/selftest
-        run: X="test_decimal" ./parallel.sh
-    required_packages:
-    - python3-tkinter  # for selftest
-    - python3-test  # for selftest
-    - python3-rpm-macros  # for dynamic python version