Create separate fmf plans for public and private tests

Tests are now upstreamed in Gitlab instead of Fedora Pagure

ci.fmf

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+resultsdb-testcase: separate

plans/internal.fmf

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+summary: Private (RHEL) beakerlib tests
+enabled: false
+adjust:
+  - when: distro == rhel
+    enabled: true
+    because: private tests are accesible only within rhel pipline
+discover:
+  - name: rhel-libarchive
+    how: fmf
+    url: git://pkgs.devel.redhat.com/tests/libarchive
+  - name: distribution
+    how: fmf
+    url: git://pkgs.devel.redhat.com/tests/distribution
+    test: /install/rhel-buildroot
+execute:
+    how: tmt

plans/public.fmf

@@ -0,0 +1,7 @@
+summary: Public (Gitlab) beakerlib tests
+discover:
+  - name: gitlab
+    how: fmf
+    url: https://gitlab.com/redhat/centos-stream/tests/libarchive.git
+execute:
+    how: tmt