Add gating based on c9s one and also based on Parag's python-fs one

.fmf/version

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+1

gating.yaml

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+--- !Policy
+product_versions:
+  - rhel-10
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}
+
+

plans/python-mako.fmf

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+discover:
+  - name: smoke-tests
+    how: shell
+    tests:
+    - name: python-import-test
+      test: python3 -c 'import mako'
+      require:
+      - python3-mako
+      duration: 1m
+execute:
+  how: tmt