manually override stop ordering for green line branch merging

[bfauble]

Summary of changes

Asana Ticket: TICKET_NAME

Current logic defaults to placing smaller branch after longer branch. In the case of Green-E/D the branch between Union Square/Medford and North station is considered a smaller branch than the remainder of the line and placed at the wrong end of the list. This is an explicit catch for this unique scenario and should not affect any others.

[github-actions]

Coverage of commit 5de0e99

Summary coverage rate:
  lines......: 89.6% (4022 of 4488 lines)
  functions..: 70.6% (2202 of 3121 functions)
  branches...: no data found

Files changed coverage rate:
                                                                        |Lines       |Functions  |Branches    
  Filename                                                              |Rate     Num|Rate    Num|Rate     Num
  ============================================================================================================
  apps/state/lib/state/stops_on_route.ex                                |93.2%    103|96.8%    31|    -      0

Download coverage report

[jfabi]

@bfauble I just deployed this to dev-blue, and things seem to look good here 🎉—reconfigured the GTFS-creator branch and gave CI another run there. I'll wait to make sure it all passes (I anticipate it will), and then will give the ✅ approval here.

[jfabi]

🙏 🎉 Thank you for all the spelunking you had to do to put this together. Here's to rebuilding our stops-on-route logic very soon!