Platform spec cel unit test

[jcpowermac]

Adds a generic CRD validation test module (tests/crd/) that verifies
kubebuilder markers are correctly reflected in the generated CRD schema
and behaviorally tests CEL rules via envtest. vSphere is the first
consumer with 35 schema tests and 15 behavioral CEL tests.

Replaces dual Format=ipv4/Format=ipv6 markers on NetworkDeviceSpec
fields (gateway, ipAddrs, nameservers) with CEL XValidation rules,
since only the last Format marker was taking effect.

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[jcpowermac]

/test unit

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