[QA] Add acceptance tests for trashbin_skip settings

PR #38704 added config parameters that can control what files do or do not go in the trashbin:
`trashbin_skip_directories`
`trashbin_skip_extensions`
`trashbin_skip_size_threshold`

Add some acceptance test scenarios to cover each of these, and a combination of all 3. IMO it can all be done with API tests.