chore: remove unused files (#4433)

## What type of PR is this? (check all applicable)

- [x] Cleanup


## Have you discussed this change with the InvokeAI team?
- [x] Yes
- [ ] No, because:

## Description

Used https://github.com/albertas/deadcode to get rough overview of what
is not used, checked everything manually though. App still runs.

## Related Tickets & Documents

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- Closes #4424

## QA Instructions, Screenshots, Recordings

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Ensure it doesn't explode when you run it.

Author: blessedcoolant