Migrate to TMT-style gating in C9S

This is required for RHIVOS, see VROOM-23635.

.fmf/version

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+1

ci.fmf

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+resultsdb-testcase: separate

gating.yaml

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+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build./plans/fedora.functional}
+  - !PassingTestCaseRule {test_case_name: osci.brew-build./plans/tier1-internal.functional}

plans/fedora.fmf

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+summary: Basic smoke test
+discover:
+    how: fmf
+    url: https://src.fedoraproject.org/tests/bzip2.git
+execute:
+    how: tmt

plans/tier1-internal.fmf

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+summary: Internal gating tests plan
+discover:
+  - name: Internal gating tests
+    how: fmf
+    filter: 'tag: CI-Tier-1'
+    url: https://pkgs.devel.redhat.com/git/tests/bzip2
+execute:
+    how: tmt
+adjust:
+    enabled: false
+    when: distro == centos-stream or distro == fedora