[DeletionVectorsSuite] Delete commit json then write the new json (de…

…lta-io#2836)

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#### Which Delta project/connector is this regarding?
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request title
For example: [Spark] Title of my pull request
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- [ ] Spark
- [ ] Standalone
- [ ] Flink
- [ ] Kernel
- [ ] Other (fill in here)

## Description

Delete commit json then write the new json as env may cannot overwrite
file.

## How was this patch tested?

UT

spark/src/test/scala/org/apache/spark/sql/delta/deletionvectors/DeletionVectorsSuite.scala

@@ -828,6 +828,7 @@ object DeletionVectorsSuite {
     val logJsonContent = FileUtils.readFileToString(logJson, "UTF-8")
     val newLogJsonContent = logJsonContent.replace(
       "{{FOLDER_WITH_SPECIAL_CHAR}}", fullPath)
+    FileUtils.delete(logJson)
     FileUtils.write(logJson, newLogJsonContent, "UTF-8")
   }
 }