Revert "Migrate to GTFS-rt predictions and locations feeds"

[PaulJKim]

Reverts #743

Unfortunately after deploying this migration last week, we started seeing some erroneous changes in predictions particularly with BRD predictions at terminals and passthrough announcements.

We should revert the migration for now to reduce the rider impact and to give us some space to do a deeper investigation into what could be causing the discrepancies in predictions when consuming the concentrate feeds vs the RTR feeds.

[github-actions]

Coverage of commit 472b95e

Summary coverage rate:
  lines......: 73.5% (2118 of 2880 lines)
  functions..: 76.7% (585 of 763 functions)
  branches...: no data found

Files changed coverage rate:
                                                             |Lines       |Functions  |Branches    
  Filename                                                   |Rate     Num|Rate    Num|Rate     Num
  =================================================================================================
  lib/content/message/predictions.ex                         |71.9%    128| 100%    17|    -      0
  lib/fake/httpoison.ex                                      |74.5%     47|57.1%     7|    -      0
  lib/predictions/last_trip.ex                               |78.6%     14| 100%     3|    -      0
  lib/predictions/prediction.ex                              | 100%      1| 100%     2|    -      0
  lib/predictions/predictions.ex                             | 100%     40| 100%     6|    -      0
  lib/signs/utilities/predictions.ex                         |98.6%     71| 100%    12|    -      0

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