## Description 

Currently, the pruner assumes that all partitioned tables are
partitioned on epoch, which is an issue since `objects_version` is not
partitioned by epoch. Modify the pruner so that it will filter out
non-epoch-partitioned tables, and otherwise do the same thing.

Change `EPOCHS_TO_KEEP` from an env variable to a config, so we can pass
in test values through the transactional test runner, and a prune.move
test to validate that we prune epoch data without any trouble.

## Test plan 

prune.move

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