fix(bus): deduplicate added trips

[runkelcorey]

Asana Task

What changes does this PR propose?

Adds TM's pullout ID and vehicle label as primary keys to deduplicate added/overloaded trips.

How were these changes validated?

1. Updates existing tests
2. Adds new test to ensure that TM stop sequence is monotonic
3. Ran many examples

What questions should reviewers consider?

None.

[github-actions]

LCOV of commit 50e3b83 during Continuous Integration (Python) #1731

Summary coverage rate:
  lines......: 61.5% (3300 of 5364 lines)
  functions..: 28.3% (255 of 900 functions)
  branches...: no data found

Files changed coverage rate:
                                                                                     |Lines       |Functions  |Branches    
  Filename                                                                           |Rate     Num|Rate    Num|Rate     Num
  =========================================================================================================================
  src/lamp_py/bus_performance_manager/combined_bus_schedule.py                       |97.1%     35|50.0%     2|    -      0
  src/lamp_py/bus_performance_manager/events_joined.py                               |77.4%     62|31.2%    16|    -      0
  src/lamp_py/bus_performance_manager/events_metrics.py                              |67.2%     58|33.3%    12|    -      0
  src/lamp_py/bus_performance_manager/events_tm.py                                   |69.6%     56|33.3%     6|    -      0
  src/lamp_py/bus_performance_manager/events_tm_schedule.py                          | 100%     32|50.0%     2|    -      0
  src/lamp_py/tableau/jobs/bus_performance.py                                        |55.9%     59| 0.0%    18|    -      0