Add ability to override initial INSERT SETTINGS via SYSTEM FLUSH DISTRIBUTED

[azat]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Add ability to override initial INSERT SETTINGS via SYSTEM FLUSH DISTRIBUTED

This is useful to overwrite settings in the initial query during force flush with SYSTEM FLUSH DISTRIBUTED.

For example imagine that your server is out of queries (max_max_concurrent_queries_for_all_users had been reached), but you want to flush the distributed table anyway, after this patch you can use something like this:

SYSTEM FLUSH DISTRIBUTED dist SETTINGS max_concurrent_queries_for_all_users=1000000

And also fix flush_on_detach for SYSTEM FLUSH DISTRIBUTED, it should ignore flush_on_detach (#53501).

Fixes: #41924

[robot-ch-test-poll2]

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[alexey-milovidov]

Wow, this is much cleaner, better, and easier to understand!

[azat]

Flaky check found something interesting for the new test, it should be fixed by #61867

[sunny19930321]

this PR is better