Allow configuring osiris data_dir in Cuttlefish config (backport #14814)

[mergify]

This is the same as the raft.data_dir option but for Osiris' data directory. Configuring this in Cuttlefish is nicer than the existing $RABBITMQ_STREAM_DIR environment variable way of changing the dir.

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This is an automatic backport of pull request #14814 done by Mergify.

[mergify]

Cherry-pick of c81fbc5 has failed:

On branch mergify/bp/v4.2.x/pr-14814
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Unmerged paths:
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	both modified:   deps/rabbit/priv/schema/rabbit.schema
	both modified:   deps/rabbit/test/config_schema_SUITE_data/rabbit.snippets

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