UPDATE - VM storage migration for OCP 4.18

Remove tech preview references

https://github.com/openshift/openshift-docs/pull/81461#discussion_r1918605775

In 4.18 (or MTC 1.8.6 actually) it is possible to switch volume mode. The UI has been modified to handle this scenario.

https://github.com/openshift/openshift-docs/pull/81461#discussion_r1918606512

In 4.18 hotplugged volumes can be live migrated. In 4.17 they cannot.

https://github.com/openshift/openshift-docs/pull/81461#discussion_r1949238162

So in 4.18 running has been deprecated, in favor of runStrategy. So instead of running: false please use runStrategy: Manual this will create the VM but not have it running.

https://github.com/openshift/openshift-docs/pull/81461#discussion_r1949247148

Instead of running: true use runStrategy: Always or runStrategy: RerunOnFailure to start the VM. Always will always restart the VM if it stops, and RerunOnFailure is similar to Always except that it only restarts if the VM is stopped in an uncontroller fashion like it crashing or running out of memory.

Add link to this PR - https://github.com/openshift/openshift-docs/pull/86954#issuecomment-2637880299