fix: fix duplicate route patterns returned when filtering by date

[bfauble]

Summary of changes

Asana Ticket: N/A

list of route_pattern_ids included duplicates because of multiple trips being returned with the same id causing multiple duplicates of the same RoutePattern to be returned via the api when filtering by date.

[github-actions]

Coverage of commit 769bab4

Summary coverage rate:
  lines......: 89.3% (4128 of 4624 lines)
  functions..: 70.9% (2231 of 3145 functions)
  branches...: no data found

Files changed coverage rate:
                                                                        |Lines       |Functions  |Branches    
  Filename                                                              |Rate     Num|Rate    Num|Rate     Num
  ============================================================================================================
  apps/api_web/lib/api_web/controllers/route_pattern_controller.ex      |98.2%     55| 100%    23|    -      0

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