CORE-5832 Added required email param to more endpoints.

Added SecuredQueryParamsEmailRequired to additional /apps/ endpoints.
Added to /apps/categories endpoints for correct public app listings and public app counts.
CORE-5832 Removed workspace_id and description from categories.

Removed workspace_id and description from /apps/categories endpoint JSON responses.
Renamed kameleon.app-groups/get-app-group to get-app-category.
CORE-5832 Updated /apps/arg-preview validation.

Added AppArgPreview schema for this endpoint that allows optional ID fields.