Assume a baseline of 3.0 for server protocol versions

Kafka 4.0 will remove support for zk mode and will require conversion to kraft before upgrading to 4.0. The minimum kraft version is 3.0 (aka 3.0-IV1).

This provides an opportunity to remove exclusively server side protocols versions that only exist to allow direct upgrades from versions older than 3.0 or that are used only by zk mode.

Since KRaft became production ready in 3.3, we should consider setting the baseline to 3.3. But that requires more discussion and it can be done via a separate change (KAFKA-18601).

Protocol changes:

• Remove RequestHeader v0 (only used by ControlledShutdown v0)
• Remove WriteTxnMarkers v0
• Remove all versions of ControlledShutdown, LeaderAndIsr, StopReplica, UpdateMetadata