chore: create type for unique role names (#13506)

* chore: create type for unique role names

Using `string` was confusing when something should be combined with
org context, and when not to. Naming this new name, "RoleIdentifier"

coderd/database/modelmethods.go

@@ -7,6 +7,7 @@ import (
 
 	"golang.org/x/exp/maps"
 	"golang.org/x/oauth2"
+	"golang.org/x/xerrors"
 
 	"github.com/coder/coder/v2/coderd/database/dbtime"
 	"github.com/coder/coder/v2/coderd/rbac"
@@ -373,3 +374,22 @@ func (p ProvisionerJob) FinishedAt() time.Time {
 
 	return time.Time{}
 }
+
+func (r CustomRole) RoleIdentifier() rbac.RoleIdentifier {
+	return rbac.RoleIdentifier{
+		Name:           r.Name,
+		OrganizationID: r.OrganizationID.UUID,
+	}
+}
+
+func (r GetAuthorizationUserRolesRow) RoleNames() ([]rbac.RoleIdentifier, error) {
+	names := make([]rbac.RoleIdentifier, 0, len(r.Roles))
+	for _, role := range r.Roles {
+		value, err := rbac.RoleNameFromString(role)
+		if err != nil {
+			return nil, xerrors.Errorf("convert role %q: %w", role, err)
+		}
+		names = append(names, value)
+	}
+	return names, nil
+}