fix: multipart replication and encrypted etag for sse-s3 (#13171)

Replication was not working properly for encrypted
objects in single PUT object for preserving etag,

We need to make sure to preserve etag such that replication
works properly and not gets into infinite loops of copying
due to ETag mismatches.

cmd/object-api-datatypes.go

@@ -165,8 +165,6 @@ type ObjectInfo struct {
 
 	Legacy bool // indicates object on disk is in legacy data format
 
-	Multipart bool // indicates if object is multipart object.
-
 	// backendType indicates which backend filled this structure
 	backendType BackendType
 
@@ -187,7 +185,6 @@ func (o ObjectInfo) Clone() (cinfo ObjectInfo) {
 		Size:               o.Size,
 		IsDir:              o.IsDir,
 		ETag:               o.ETag,
-		Multipart:          o.Multipart,
 		InnerETag:          o.InnerETag,
 		VersionID:          o.VersionID,
 		IsLatest:           o.IsLatest,