Enhanced TMT testing for centos-stream

Resolves: #2182340

.fmf/version

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+1

ci.fmf

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+resultsdb-testcase: separate

plans/public.fmf

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+summary: Test plan that runs all tests from tests repo.
+discover:
+    how: fmf
+    url: https://src.fedoraproject.org/tests/spamassassin.git
+execute:
+    how: tmt
+

plans/tier1-internal.fmf

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+summary: CI plan, picks Tier1 tests, runs in beakerlib.
+discover:
+  - name: rhel
+    how: fmf
+    filter: 'tier: 1'
+    url: git://pkgs.devel.redhat.com/tests/spamassassin
+  - name: fedora
+    how: fmf
+    filter: 'tier: 1'
+    url: "https://src.fedoraproject.org/tests/spamassassin.git"
+execute:
+    how: tmt
+adjust:
+    enabled: false
+    when: distro == centos-stream-9