Adopt conmon-rs as default container monitor

[saschagrunert]

Propose switching CRI-O from the traditional per-container conmon to the pod-level conmon-rs monitor in OpenShift.

• Introduce ConmonRS feature gate in TechPreviewNoUpgrade
• Extend ContainerRuntimeConfig with a containerMonitor field (PascalCase enum: Conmon, ConmonRS)
• Move conmon-rs package from RHCOS layer to the Node Layer (OCP-aligned versioning)
• Graduate from Tech Preview (opt-in) to GA (default) over one minor release cycle
• Tracking: OCPNODE-1288

/cc @haircommander @rphillips

[openshift-ci]

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[saschagrunert]

@bitoku @harche @QiWang19 PTAL, too

[openshift-ci]

@saschagrunert: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/markdownlint	0b18266	link	true	/test markdownlint

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[haircommander]

personally I prefer embedding in default runtime. there could be a "crun-conmonrs" option. less api surface. I don't feel really stubborn about that though