Add uncategorised cookie category

Replace the `required` boolean column on cookie_categories with a `kind`
enum (NORMAL, NECESSARY, UNCATEGORISED). The Necessary category remains
undeletable and always-on for consent; the new Uncategorised category is
also undeletable but users can opt out of it.

When a category is deleted, its cookies are merged into the Uncategorised
category (lazy-created for legacy banners that don't have one yet).

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/server/api/console/v1/cookie_banner_resolvers.go

@@ -354,7 +354,6 @@ func (r *mutationResolver) CreateCookieCategory(ctx context.Context, input types
 			CookieBannerID: input.CookieBannerID,
 			Name:           input.Name,
 			Description:    input.Description,
-			Required:       input.Required,
 			Rank:           input.Rank,
 			Cookies:        cookies,
 		},
@@ -461,7 +460,7 @@ func (r *mutationResolver) DeleteCookieCategory(ctx context.Context, input types
 		if errors.Is(err, cookiebanner.ErrCategoryNotFound) {
 			return nil, gqlutils.NotFound(ctx, err)
 		}
-		if errors.Is(err, cookiebanner.ErrCannotDeleteRequiredCategory) {
+		if errors.Is(err, cookiebanner.ErrCannotDeleteSystemCategory) {
 			return nil, gqlutils.Conflict(ctx, err)
 		}
 		r.logger.ErrorCtx(ctx, "cannot delete cookie category", log.Error(err))

pkg/server/api/console/v1/graphql/cookie_banner.graphql

@@ -90,7 +90,7 @@ type CookieCategory implements Node {
     cookieBanner: CookieBanner @goField(forceResolver: true)
     name: String!
     description: String!
-    required: Boolean!
+    kind: String!
     rank: Int!
     cookies: [CookieItem!]!
     createdAt: Datetime!
@@ -212,7 +212,6 @@ input CreateCookieCategoryInput {
     cookieBannerId: ID!
     name: String!
     description: String!
-    required: Boolean!
     rank: Int!
     cookies: [CookieItemInput!]
 }

pkg/server/api/console/v1/types/cookie_category.go

@@ -77,7 +77,7 @@ func NewCookieCategory(c *coredata.CookieCategory) *CookieCategory {
 		},
 		Name:        c.Name,
 		Description: c.Description,
-		Required:    c.Required,
+		Kind:        string(c.Kind),
 		Rank:        c.Rank,
 		Cookies:     cookies,
 		CreatedAt:   c.CreatedAt,