Add gating yaml and test plans

Resolves: RHEL-85229

ci.fmf

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+resultsdb-testcase: separate
+

gating.yaml

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

plans/internal.fmf

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+summary: Internal tests plan
+discover:
+    how: fmf
+    url: https://pkgs.devel.redhat.com/git/tests/docbook-utils
+execute:
+    how: tmt
+adjust:
+    enabled: false
+    when: distro == centos-stream or distro == fedora
+    because: No access to internal git repositories