Part of #14181

Due to issues #14151, #14149 & #14182

This reverts commit b23229f6.

This reverts commit f9c002e4.

This reverts commit 873d095a.

Fixes #14060

This change does the following:
- filesToRestore are no longer checked at all, instead the the already existing
  editorStacks.model value from local storage restores the files just like
  normal.
- Loading of the resource is now solely the responsibility of
  TextFileEditorModel, removing a lot of the stuff being passed down through
  the layers.

Fixes #14100
Fixes #14067

See #12400 & #13305

Also clean up shutdown logic to fix issue where backup workspaces were not
being evicted from workspaces.json.

jsdoc was only added for the renderer side interface as they will soon
be merged together.

This reverts commit d1d39f1e.