MITLibraries / transmogrifier / 14869133438

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main: 99%

Pull #249

github

Remove parquet feature flags

Why these changes are being introduced:

At the onset of the parquet dataset work, feature flags were used
to support both pre-parquet and parquet code pathways.  With the
parquet dataset working and fully utilized now, we can remove
the feature flags.

This project required some additional tweaks when removing the flags,
namely updating tests to be fully parquet compliant.

How this addresses that need:
* Remove all feature flag code branching
* Update Transformer class to support missing 'source_file', if
testing environment detected, to remain backwards compatible with
many tests

Side effects of this change:
* Original "v1" support is ended.

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/TIMX-489

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