Add Override for Initial INSERT Settings with SYSTEM FLUSH DISTRIBUTED

Why it matters

This feature allows users to customize and control the behavior of INSERT operations triggered by the SYSTEM FLUSH DISTRIBUTED command by overriding default settings. It improves flexibility and helps address scenarios where specific INSERT settings are required during distributed data flushing.

How to use it

When using the SYSTEM FLUSH DISTRIBUTED command, users can now specify overridden INSERT settings to control how data is inserted during the flush operation. This is done by including the desired settings as part of the command invocation or configuration.