Fix the way selections are built in `Editor::select_all_matches` in
order to guarantee that the original selection, where the user's cursor
is located, is the last selection provided to
`MutableSelectionsCollection::select_ranges` as the editor will attempt
to scroll to the last selection when the user starts editing.

This way, we ensure that the user stays in the same location from which
the `editor: select all matches` action was triggered when they start
editing.

Closes #32894

Release Notes:

- Fixed an issue where editing selections after `editor: select all
matches` would scroll to the last match

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Co-authored-by: dino <dinojoaocosta@gmail.com>