Drop unused access review source category

Source category was never surfaced in the product and added noise to
snapshots and APIs. Remove the enum, columns, and service fields so
campaign sources track only the identity fields reviewers need.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/accessreview/source_service.go

@@ -37,14 +37,12 @@ type (
 		OrganizationID gid.GID
 		ConnectorID    *gid.GID
 		Name           string
-		Category       coredata.AccessReviewSourceCategory
 		CsvData        *string
 	}
 
 	UpdateAccessReviewSourceRequest struct {
 		AccessReviewSourceID gid.GID
-		Name                 *string
-		Category             *coredata.AccessReviewSourceCategory
+		Name                 **string
 		ConnectorID          **gid.GID
 		CsvData              **string
 	}
@@ -60,7 +58,6 @@ func (r *CreateAccessReviewSourceRequest) Validate() error {
 
 	v.Check(r.OrganizationID, "organization_id", validator.Required(), validator.GID(coredata.OrganizationEntityType))
 	v.Check(r.Name, "name", validator.SafeTextNoNewLine(NameMaxLength))
-	v.Check(r.Category, "category", validator.OneOfSlice(coredata.AccessReviewSourceCategories()))
 
 	return v.Error()
 }
@@ -79,7 +76,6 @@ func (r *UpdateAccessReviewSourceRequest) Validate() error {
 
 	v.Check(r.AccessReviewSourceID, "access_review_source_id", validator.Required(), validator.GID(coredata.AccessReviewSourceEntityType))
 	v.Check(r.Name, "name", validator.SafeTextNoNewLine(NameMaxLength))
-	v.Check(r.Category, "category", validator.OneOfSlice(coredata.AccessReviewSourceCategories()))
 
 	return v.Error()
 }
@@ -99,7 +95,6 @@ func (s *Service) CreateSource(
 		OrganizationID: req.OrganizationID,
 		ConnectorID:    req.ConnectorID,
 		Name:           req.Name,
-		Category:       req.Category,
 		CsvData:        req.CsvData,
 		CreatedAt:      now,
 		UpdatedAt:      now,
@@ -169,11 +164,9 @@ func (s *Service) UpdateSource(
 			}
 
 			if req.Name != nil {
-				source.Name = *req.Name
-			}
-
-			if req.Category != nil {
-				source.Category = *req.Category
+				if *req.Name != nil {
+					source.Name = **req.Name
+				}
 			}
 
 			if req.ConnectorID != nil {