Baptiste Lemaire c625b8d017 Add condition on NotifyOnFlushComplete that FlushJob was not mempurge. Add event listeners to mempurge tests. (#8672)
Summary:
Previously, when a `FlushJob` was redirected to a MemPurge, the function `DBImpl::NotifyOnFlushComplete` was called, which created a series of issues because the JobInfo was not correctly collected from the memtables.
This diff aims at correcting these two issues (`FlushJobInfo` collection in `FlushJob::MemPurge` , no call to `DBImpl::NotifyOnFlushComplete` after successful mempurge).
Event listeners were added to the unit tests to handle these situations.
Surprisingly none of the crashtests caught this issue, I will try to add event listeners to crash tests in the future.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8672

Reviewed By: akankshamahajan15

Differential Revision: D30383109

Pulled By: bjlemaire

fbshipit-source-id: 35a8d4295886923ee4049a6447f00022cb221c73
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