Add tmt plan for gating

Cherry-picked from python3.11-urllib3 095ef781f440c73487a2b96d150ca18e7346d2ce
095ef781f4

.fmf/version

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+1

gating.yaml

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+--- !Policy
+
+product_versions:
+  - rhel-8
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

plan.fmf

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+execute:
+  how: tmt
+discover:
+  how: shell
+  dist-git-source: true
+  tests:
+  - name: bundled tests
+    require:
+    - python3.12-pytest
+    - python3.12-pip
+    - python3.12-cryptography
+    - python3.12-pycparser
+    - python3.12-cffi
+    - python3.12-urllib3
+    test: |
+      pip3.12 install trustme==0.9.0 tornado==6.2 pytest-freezegun==0.4.2 &&
+      cd $(dirname $TMT_SOURCE_DIR/urllib3-*/test) &&
+      rm -rf test/appengine test/test_no_ssl.py &&
+      rm -rf test/with_dummyserver test/contrib &&
+      sed -i -e 's/^import mock/from unittest import mock/' \
+        -e 's/^from mock import /from unittest.mock import /' \
+        test/*.py docs/conf.py &&
+      pytest-3.12 test