fix: reject empty versionId query parameter in object actions

S3 returns `InvalidArgument` when an object action receives a `versionId` query parameter with no value. The gateway silently treated it as an unversioned request instead.

Added a shared `versionId` validation helper and apply it to the object actions that accept the parameter, so malformed requests are rejected up front rather than reaching the backend.

tests/integration/GetObjectAttributes.go

@@ -20,6 +20,7 @@ import (
 	"crypto/rand"
 	"errors"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"github.com/aws/aws-sdk-go-v2/service/s3"
@@ -273,3 +274,7 @@ func GetObjectAttributes_checksums(s *S3Conf) error {
 		return nil
 	})
 }
+
+func GetObjectAttributes_empty_version_id(s *S3Conf) error {
+	return testEmptyVersionId(s, "GetObjectAttributes_empty_version_id", http.MethodGet, "attributes", nil)
+}