This is an issue resulting from the merge with the
collections-project-bulk-actions branch. A missing search string was
allowed in the form validation, but would fail as it tried to
lower-case the nil string.

Final touches Collection backend polish

Remove collection parameter from search endpoint

Collections project bulk actions

This collection parameter functionality will be handled by
`/api/collection/:id`. This commit also renames the `favorited` key in
the response to `favorite` and `type` to `model`.

This commit also adds more tests around permissions related to search
and collections

Logic + tests for moving Collections "across the boundary" 

Copy permissions for parent when creating new Collection

Grant Current User perms for descendants of their Personal Collection

Finish implementing nested collections on CollectionsLanding, migration item type->model and favorited->favorite

Rework GET /api/collection/:id to return things in 'search-friendly' format

List user collections for admins

Finally drop RawTable & RawColumn tables. Bye Felicia! 

Merge branch 'collections-project-bulk-actions' of github.com:metabase/metabase into collections-project-bulk-actions

xray api: add permission checks and tests for said checks

* extract candidates loader

* add candidates to overworld

* add description and fix explore padding

* prettier

* show recently connected DB

* layout tweaks

* link to / instead of explore when ending setup

* fix signup test