Summary:
Summary : Set manual_compaction false in case of DeleteTriggeredCompaction object so that kFilesMarkedForComapaction can be reported.
          Added a DeletionTriggeredUniversalCompactionMarking test case for Deletion Triggered compaction in case of Universal Compaction.

Test Plan : make check -j64
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6680

Test Plan: make check -j64

Reviewed By: anand1976

Differential Revision: D20945946

Pulled By: akankshamahajan15

fbshipit-source-id: af84e417bd7127652aaae9143c560d1ab3815d25