Merge #11865

11865: Fix: Select correct insert position for disabled group import r=jonasbb a=jonasbb

The logic for importing with and without `group_imports` differed
significantly when no previous group existed. This lead to the problem
of using the wrong position when importing inside a module (#11585) or
when inner attributes are involved.
The existing code for grouped imports is better and takes these things
into account.

This PR changes the flow to use the pre-existing code for adding a new
import group even for the non-grouped import settings.
Some coverage markers are updated and the `group` is removed, since they
are now invoked in both cases (grouping and no grouping).

Tests are updated and two tests (empty module and inner attribute) are
added.

Fixes #11585

Co-authored-by: Jonas Bushart <jonas@bushart.org>

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