Document cutback workflow after pcr from non-ua to ua

[kathancox]

Fixes DOC-10573

PR adds docs to for the cutback process after PCR between a cluster without virtualization enabled and a virtualized standby cluster. The cutback process can't rely on the primary already having data in a main virtual cluster, so users have a couple options here. However, both will involve an initial scan.

Cluster naming here is tricky to document, so similar to the "regular" cutback process have labeled cluster by letter.

[github-actions[bot]]

Files changed:

• src/current/v24.1/cutover-replication.md
• src/current/v24.1/set-up-physical-cluster-replication.md
• src/current/v24.2/cutover-replication.md
• src/current/v24.2/set-up-physical-cluster-replication.md

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