Fixes #15515

Fixes #15260

Since text files in workspaces are now restored using the regular workspace
restore code and models check when opened if there is a backup available,
the registration and deregistration of workspace resources is no longer
necessary.

Fixes #14064

workspaces.json now tracks all workspaces
workspace.json now tracks a list of textfiles in the workspace

Part of #14064

Due to issues #14151, #14149 & #14182

This reverts commit b23229f6.

This reverts commit aab05a86.

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

Fixes #14068

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

The dep can't be fulfilled on main process

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