feat(ingestion): ingest TripProperties.trip_headsign

[rudiejd]

Asana Task: https://app.asana.com/1/15492006741476/project/1189492770004753/task/1215143305292180?focus=true

What changes does this PR propose?

Adds TripUpdate.TripProperties.trip_headsign to LAMP ingestion

How were these changes validated?

Covered by existing tests - I modified the input files to make sure this field is tested.

What questions should reviewers consider?

n/a

[rudiejd]

there are more fields in the spec, but this is the only one we populate for now

[huangh]

@runkelcorey why did the alert test fail? order dependency again?

[github-actions]

LCOV of commit 04571ff during Continuous Integration (Python) #2005

Summary coverage rate:
  lines......: 64.6% (3592 of 5562 lines)
  functions..: 29.9% (275 of 920 functions)
  branches...: no data found

Files changed coverage rate:
                                                                                     |Lines       |Functions  |Branches    
  Filename                                                                           |Rate     Num|Rate    Num|Rate     Num
  =========================================================================================================================
  src/lamp_py/ingestion/config_rt_trip.py                                            |82.4%     17|12.5%     8|    -      0
  src/lamp_py/ingestion/gtfs_rt_structs.py                                           | 100%      7|    -     0|    -      0

[rudiejd]

tests should be good now!

[runkelcorey]

Thank you! I deployed ingestion to dev and saw some records with headsign values!