For COPY operations treat 0 as infinite timeout in addition to -1 (np…

…gsql#6352)

Fixes npgsql#6351

(cherry picked from commit 785b0b8)

Fix getting wrong schema with CommandBehavior.SchemaOnly and autoprep…

…are (npgsql#6040)

Fixes npgsql#6038

(cherry picked from commit 5ede53c)

Fix getting wrong schema with CommandBehavior.SchemaOnly and autoprep…

…are (npgsql#6040)

Fixes npgsql#6038

(cherry picked from commit 5ede53c)

WIP

maim-command-execute