fix: allow DeleteObject unversioned objects with insufficient read quorum (#19581)

Since the object is being permanently deleted, the lack of read quorum should not
matter as long as sufficient disks are online to complete the deletion with parity
requirements.

If several pools have the same object with insufficient read quorum, attempt to
delete object from all the pools where it exists

cmd/erasure-metadata_test.go

@@ -210,13 +210,13 @@ func TestFindFileInfoInQuorum(t *testing.T) {
 		{
 			fis:            getNFInfo(16, 7, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil),
 			modTime:        time.Unix(1603863445, 0),
-			expectedErr:    errErasureReadQuorum,
+			expectedErr:    InsufficientReadQuorum{},
 			expectedQuorum: 8,
 		},
 		{
 			fis:            getNFInfo(16, 16, 1603863445, "36a21454-a2ca-11eb-bbaa-93a81c686f21", nil),
 			modTime:        time.Unix(1603863445, 0),
-			expectedErr:    errErasureReadQuorum,
+			expectedErr:    InsufficientReadQuorum{},
 			expectedQuorum: 0,
 		},
 		{
@@ -241,7 +241,9 @@ func TestFindFileInfoInQuorum(t *testing.T) {
 		test := test
 		t.Run("", func(t *testing.T) {
 			fi, err := findFileInfoInQuorum(context.Background(), test.fis, test.modTime, "", test.expectedQuorum)
-			if err != test.expectedErr {
+			_, ok1 := err.(InsufficientReadQuorum)
+			_, ok2 := test.expectedErr.(InsufficientReadQuorum)
+			if ok1 != ok2 {
 				t.Errorf("Expected %s, got %s", test.expectedErr, err)
 			}
 			if test.succmodTimes != nil {