Add tmt gating plan

Cherry-picked from python3.11-scipy 67801e27208adb01305579bd046956402e3dbad7
67801e2720

Amended to install pooch and assert the results.

Co-Authored-By: Miro Hrončok <miro@hroncok.cz>

.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}

plan.fmf

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+execute:
+  how: tmt
+discover:
+  how: shell
+  tests:
+  - name: bundled tests
+    require:
+    - python3.12-pip
+    - python3.12-pytest
+    - python3.12-scipy
+    - python3.12-scipy-tests
+    # transitive requirements of pooch, we want them from RHEL:
+    - python3.12-charset-normalizer
+    - python3.12-idna
+    - python3.12-requests
+    - python3.12-urllib3
+    duration: 30m
+    test: |
+      pip3.12 install pooch==1.8.0 &&
+      python3.12 -c 'import scipy; assert scipy.test()'