Fix: Polyline points order (Postgres)

[elenagensch]

Pre-Context

• Production Database uses Postgres (not SQLLite)
• Points that belong to a Polyline are sorted according the point id (e.g. Polyline with pointids:[1,2,3,4,1] is [1,1,2,3,4,] in Postgres)
• For exporting the polyline to geojson, the first point's coord must be the
• Currently, the database is not seeded for the ci, these tests fail when the db is seeded: https://github.com/hpi-swt2/compass-portal-red/runs/4840245609?check_suite_focus=true
  -> you can check the fix for adjusting the Polyline geojson logic for Postgres by seeding the ci database

Acceptance criteria

• seed db in the test and deploy workflow
• when you display an outer shape the corresponding geojson keeps the order in which the points were added to this polyline