Add tmt gating plan

Resolves: rhbz#2159317

.fmf/version

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+1

gating.yaml

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

plans/etree-fromstring.py

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+import lxml.etree as et
+s = '<foo><bar baz="xyzzy">a<![CDATA[b]]>c</bar></foo>'
+x = et.fromstring(s)
+t = x.find('bar').text
+print(t)
+if t != 'abc':
+    raise Exception()

plans/smoke.fmf

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+summary: Basic smoke test
+discover:
+  how: shell
+  tests:
+    - name: /smoke/import-python-module
+      test: |
+        python3.11 -c 'import importlib as il; print(il.import_module("lxml"))'
+    - name: /smoke/etree-fromstring
+      test: |
+        python3.11 plans/etree-fromstring.py
+execute:
+  how: tmt