Fact daily trips incremental

[lauriemerrell]

Description

Makes a test version of the gtfs_schedule_fact_daily_trips table that is incrementally materialized. We will let this run for about a week in test to confirm it is accurately replicating the current behavior and, if so, replace the old table (which currently takes 20+ minutes to run every day and causes our dbt run DAG task to fail.)

This also updates the documentation & tests on the main gtfs_schedule_fact_daily_trips table to:

1. Fix the failing uniqueness test -- this partially addresses Deal with two-row feed_info.txt #1471, though not entirely.
2. Correctly identify the (composite) primary key

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation
• agencies.yml

How has this been tested?

dbt run and dbt test both pass locally for this new table

Screenshots (optional)