Revert "feat: implement register Passkey user API v2 (#5873)"

This reverts commit a301c40f9f.

internal/api/authz/user.go

@@ -1,16 +0,0 @@
-package authz
-
-import (
-	"context"
-
-	"github.com/zitadel/zitadel/internal/errors"
-)
-
-// UserIDInCTX checks if the userID
-// equals the authenticated user in the context.
-func UserIDInCTX(ctx context.Context, userID string) error {
-	if GetCtxData(ctx).UserID != userID {
-		return errors.ThrowUnauthenticated(nil, "AUTH-Bohd2", "Errors.User.UserIDWrong")
-	}
-	return nil
-}