[SPARK-32560][SQL] Improve exception message at InsertIntoHiveTable.p…

…rocessInsert

### What changes were proposed in this pull request?
improve exception message

### Why are the changes needed?
the before message lack of single quotes, we may improve it to keep consisent.
![image](https://user-images.githubusercontent.com/46367746/89595808-15bbc300-d888-11ea-9914-b05ea7b66461.png)

### Does this PR introduce _any_ user-facing change?
NO

### How was this patch tested?
No ,it is only improving the message.

Closes #29376 from GuoPhilipse/improve-exception-message.

Lead-authored-by: GuoPhilipse <46367746+GuoPhilipse@users.noreply.github.com>
Co-authored-by: GuoPhilipse <guofei_ok@126.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
(cherry picked from commit aa4d3c1)
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala

@@ -232,7 +232,7 @@ case class InsertIntoHiveTable(
             if (fs.exists(partitionPath)) {
               if (!fs.delete(partitionPath, true)) {
                 throw new RuntimeException(
-                  "Cannot remove partition directory '" + partitionPath.toString)
+                  s"Cannot remove partition directory '$partitionPath'")
               }
             }
           }
@@ -284,7 +284,7 @@ case class InsertIntoHiveTable(
               if (fs.exists(path)) {
                 if (!fs.delete(path, true)) {
                   throw new RuntimeException(
-                    "Cannot remove partition directory '" + path.toString)
+                    s"Cannot remove partition directory '$path'")
                 }
                 // Don't let Hive do overwrite operation since it is slower.
                 doHiveOverwrite = false