[Feature Request] Include tiled windows in Window Suggestions

**Describe the feature you'd like**
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Right now, if I tile an untiled window and it shows suggestions to fill the other tiles, those suggestions don't include already tiled windows even if they are in a different tiling layout. It would be great to have an option to include already tiled windows in the suggested windows to tile

**Additional context**
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No files, tests, or entry points are named in the issue. Start by tracing how Window Suggestions are generated after tiling a window and how tiled windows are filtered across layouts. Done means an option allows already tiled windows from a different tiling layout to appear in the suggestions.

Written by the indexing model from the issue text.