[KRaft] Add support for JBOD storage in KRaft mode

[scholzj]

JBOD support is currently missing in Kafka itself. But once it is added, we will need to support it in Strimzi as well. Likely, it might include at least the following changes:

• Remove the validation that rejects clusters with multiple JBOD disks in KRaft mode
• Add handling of not deleting the metadata disks in controller nodes

The details are currently not completely clear until the implementation is finished in Kafka. This issue serves as a tracker for this part of the Strimzi implementation.

[scholzj]

Discussed in the community call on 14.12.: Not yet supported in Kafka 3.6. But we need to support it.

[scholzj]

Update: Proposal fr JBOD support in KRaft has been approved and merged: https://github.com/strimzi/proposals/blob/main/067-kraft-jbod-support.md