v.25.7Experimental Feature

Remove experimental send_metadata logic related to experimental

Official CH changelog text
Removed experimental send_metadata logic related to experimental zero-copy replication. It wasn't ever used and nobody supports this code. Since there were even no tests related to it, there is a high chance that it's broken long time ago. #82508 (alesapin).
Removed experimental send_metadata logic related to zero-copy replication.

Why it matters

This feature removal eliminates unused and unsupported experimental code for zero-copy replication metadata sending, which lacked tests and was likely broken, thus improving codebase maintainability and stability.

How to use it

No user action is required as this change removes legacy experimental functionality that was never enabled or supported.

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