build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/google.golang.org/protobuf/proto/proto.go

@@ -0,0 +1,45 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Message is the top-level interface that all messages must implement.
+// It provides access to a reflective view of a message.
+// Any implementation of this interface may be used with all functions in the
+// protobuf module that accept a Message, except where otherwise specified.
+//
+// This is the v2 interface definition for protobuf messages.
+// The v1 interface definition is [github.com/golang/protobuf/proto.Message].
+//
+//   - To convert a v1 message to a v2 message,
+//     use [google.golang.org/protobuf/protoadapt.MessageV2Of].
+//   - To convert a v2 message to a v1 message,
+//     use [google.golang.org/protobuf/protoadapt.MessageV1Of].
+type Message = protoreflect.ProtoMessage
+
+// Error matches all errors produced by packages in the protobuf module
+// according to [errors.Is].
+//
+// Example usage:
+//
+//	if errors.Is(err, proto.Error) { ... }
+var Error error
+
+func init() {
+	Error = errors.Error
+}
+
+// MessageName returns the full name of m.
+// If m is nil, it returns an empty string.
+func MessageName(m Message) protoreflect.FullName {
+	if m == nil {
+		return ""
+	}
+	return m.ProtoReflect().Descriptor().FullName()
+}