Deal with two-row feed_info.txt

[lauriemerrell]

The current Foothill Transit (ITP ID 112) feed's feed_info.txt has two rows with two sets of active dates (both have the same start date) and the same feed version identifier.

This causes fanout in the warehouse, because we have two copies of the same feed in gtfs_schedule_dim_feeds. Specifically, a test is failing on gtfs_schedule_fact_daily_trips because we have two copies of the same trip.

While this is clearly a bug in their feed, I am not entirely sure how to address this in the warehouse. I am inclined to put in a hacky condition in gtfs_schedule_dim_feeds or feed_info_clean to filter out one of these rows specifically because this should be rare and putting in logic that tries to programmatically address this kind of situation is unlikely to be robust.

AC:

• Only one row in gtfs_schedule_dim_feeds for the Foothill Transit feed from 2022-05-03.
• The unique combination of columns test on gtfs_schedule_fact_daily_trips should pass.

[holly-g]

Slack thread here: https://cal-itp.slack.com/archives/C02JFS4LAMU/p1651671937502189
Let's revisit 5/31 after receiving clarification in the GTFS spec.

[lauriemerrell]

whoops this was not supposed to be closed by #1712, reopening