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Share Groups has already deprecated this configuration and decoupled from the feature version. this configuration(though still listed in valid values in the config description). 
Both Group Coordinator and Streams rebalance protocol are currently controlled by both the `group.coordinator.rebalance.protocols` configuration and their respective feature flags (`group.version` and `streams.version`).

Deprecation Timeline

Kafka 4.2

Remove "share" from the valid values for `group.coordinator.rebalance.protocols` (i.e., "share" is not allowed as a value)

Kafka 4.3 (Deprecation Period):

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