provenance: Add ListDirectoryMaxLeafTimestamp
which takes a CSV of file timestamps, and computes for each directory the max of these timestamps
pass 2 out of 3 to implement #4782 (closed)
Staging instance, all changes can be removed at any time
which takes a CSV of file timestamps, and computes for each directory the max of these timestamps
pass 2 out of 3 to implement #4782 (closed)