Introduce and adopt ISingleFolderWorkspaceIdentifier

fixes #113562

* Initial work on "search in open editors"

* Update wording

* Update messaging for open editors config

* Add command to open all git changes (in association with searching in all open editors)

* Add strict parsing mode to search using providers for specific files

* Clean

* Remove log

* Naming

* Transfer open editors config to search editor

* Pass in more places

* Add some testing

* wip

* partially working

* actually working

* make wrapperMap for each heirarchy

* add tests

* feedback from Connor

Fixes #114690

This needs to take priority over the regular ctrl+shift+f when the
terminal has focus.

Fixes #108785

Set terminal.integrated.altClickMovesCursor: false by default, considering multiCursorModifier