[MM-32281] SqlRoleStore/GetByName: add context to allow read from master (#17176)

* role_store/GetByName: add context

* propagate context in the app layer

* propagate context in the app layer

* add missing import

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/store.go

@@ -686,7 +686,7 @@ type RoleStore interface {
 	Save(role *model.Role) (*model.Role, error)
 	Get(roleID string) (*model.Role, error)
 	GetAll() ([]*model.Role, error)
-	GetByName(name string) (*model.Role, error)
+	GetByName(ctx context.Context, name string) (*model.Role, error)
 	GetByNames(names []string) ([]*model.Role, error)
 	Delete(roleID string) (*model.Role, error)
 	PermanentDeleteAll() error