Reapply "fix: reorder output and plans in explain.slt"

This reverts commit 5d1be72.

Author: kosiew

datafusion/sqllogictest/test_files/explain.slt

@@ -647,11 +647,11 @@ logical_plan
 02)--{
 03)----"Plan": {
 04)------"Node Type": "Values",
-05)------"Values": "(Int64(1))",
-06)------"Plans": [],
-07)------"Output": [
-08)--------"column1"
-09)------]
+05)------"Output": [
+06)--------"column1"
+07)------],
+08)------"Plans": [],
+09)------"Values": "(Int64(1))"
 10)----}
 11)--}
 12)]