[release-4.22] USHIFT-6983: Drop optional components from tuned CI images#6791
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The tuned containerfiles inherited from the optional base image, which installed OLM, Istio, cert-manager, SR-IOV, and other optional components. None of the 3 scenarios using this image test optionals, but those components generated 58% of the slow etcd requests during startup on CPU-constrained ARM64 VMs (TuneD isolates most CPUs, leaving only 2 for system services). This etcd pressure contributes to PodSecurity admission timeouts that crash MicroShift on restart. Make the tuned containerfiles self-contained: inherit from test-agent, install only core MicroShift + microshift-low-latency, and configure firewall directly. This eliminates the optional component overhead without affecting any other image consumers.
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/lgtm
/label backport-risk-assessed
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This is an automated cherry-pick of #6782
/assign pacevedom