This commit updates the implementation for
`editor::Editor.manipulate_text` to use
`editor::selections_collection::SelectionsCollection.all_adjusted`
instead of `editor::selections_collection::SelectionsCollection.all`, as
the former takes into account the selection's `line_mode`, fixing the
issue where, if an user was in vim's visual line mode, running the
`editor: convert to upper case` command would not work as expected.

Closes #36953 

Release Notes:

- Fixed bug where using the editor's convert case commands while in
vim's Visual Line mode would not work as expected