fix: rides_execution not retune time whit time zone

[AvivAbachi]

This is a case of setting the wrong timezone in the client, resulting in incorrect data displayed on the gap page.

• Pass all tests.
• Test locally, the server and client with different time zones.

[OriHoch]

all the times are sent in UTC, so there is no need to add a timezone it will always be +00:00
you should handle timezone in the client-side

also, I think API should have consistent behavior currently it always returns times in UTC for all responses, so if this change is really needed then it should be applied globally to all responses, but that would be a big change affecting many places and users of the API, so I would recommend not to do that

[AvivAbachi]

https://open-bus-stride-api.hasadna.org.il/rides_execution/list?limit=1&date_from=2024-11-03&date_to=2024-11-03&operator_ref=3&line_ref=37689

• before

[
  {
    "planned_start_time": "2024-11-03T03:45:00",
    "actual_start_time": "2024-11-03T03:45:00",
    "gtfs_ride_id": 91413633
  }
]

• after

[
  {
    "planned_start_time": "2024-11-03T03:45:00+00:00",
    "actual_start_time": "2024-11-03T03:45:00+00:00",
    "gtfs_ride_id": 91413633
  }
]

This is the only place it is not returning with +00:00

[OriHoch]

you are right my mistake, I see most other places also return with timezone