Deprecate `queue_master_locator`

[lukebakken]

See this discussion:
https://vmware.slack.com/archives/C055BSG8E/p1709799850327309

queue_master_locator only applies to mirrored classic queues, which will be removed in RabbitMQ 4.0, so this policy setting should be removed as well.

queue_leader_locator is the setting to use for QQs and Streams.

Describe the solution you'd like

Remove queue_master_locator setting.

[ansd]

queue_master_locator only applies to mirrored classic queues

This setting also applies to non-mirrored classic queues.

[mkuratczyk]

Fixed in #11565