Decouple uni04delta network stage from control plane stage

[jirimacku]

Highly inspired by the #489

This makes the networking components MetalLB NetConfig and Net-attach-def separated for the control plane stage. This allows to create an adoption job based on UniDelta architecture. The adoption job needs to deploy just the networking but not the control plane itself.

[openshift-ci]

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ noop SUCCESS in 0s
❌ rhoso-architecture-validate-uni04delta FAILURE in 4m 02s

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❌ rhoso-architecture-validate-uni04delta FAILURE in 4m 06s

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❌ rhoso-architecture-validate-uni04delta FAILURE in 5m 24s

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✔️ noop SUCCESS in 0s
❌ rhoso-architecture-validate-uni04delta FAILURE in 5m 12s

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ noop SUCCESS in 0s
❌ rhoso-architecture-validate-uni04delta FAILURE in 5m 10s

[jirimacku]

/retest