Add TMT test infrastructure for conmon

Add .fmf/, plans/, and tests/ directories to enable automated
tier0 testing in the RHEL-on-GitLab MR pipeline. Port TMT
configuration from rhel-9.8.0 branch, updated to reference
c10s branch of the test repository.

Also add tier0 gating rule to gating.yaml.

Resolves: RHEL-180349

conmon.spec

@@ -21,7 +21,7 @@ Epoch: 2
 %endif
 Version: 2.2.1
 License: Apache-2.0
-Release: 3%{?dist}
+Release: 4%{?dist}
 Summary: OCI container runtime monitor
 URL: https://github.com/containers/%{name}
 # Tarball fetched from upstream
@@ -70,6 +70,10 @@ sed -i 's/install.bin: bin\/conmon/install.bin:/' Makefile
 %endif
 
 %changelog
+* Fri May 29 2026 Jindrich Novy <jnovy@redhat.com> - 2:2.2.1-4
+- Add TMT test infrastructure for tier0 gating
+- Resolves: RHEL-180349
+
 * Fri Feb 27 2026 Jindrich Novy <jnovy@redhat.com> - 2:2.2.1-3
 - pass %%{optflags} and %%{build_ldflags} to enable stack protector
   and FORTIFY_SOURCE hardening flags