whitespace changes
Changing upload_filters help text to tell users about possible values
Merge pull request #117 from alphagov/better-upload-filters-help-text

Better upload filters help text
Detail validation rules for data set name in help text
Merge pull request #118 from alphagov/data-set-validations-in-help-text

Detail validation rules for data set name in help text
[#68811824] Add delete back into the admin UI

- Doesn't remove data-set from backdrop
- Admin UI automatically gives safety warning
Add in test for deleting data-sets

- Remove old test that asserted that we can't delete data-sets
- Mocked as per all the others tests
Remove DeleteNotImplementedError on delete method

- Also add in `purge`
Rename CREATE_COLLECTION_ENDPOINT_TOKEN

- Use STAGECRAFT_COLLECTION_ENDPOINT_TOKEN instead, as we want to use it for deleting collections as well
Test that caches are purged on delete