tweak: Suppress automated alerts on pre-fares & DUPs, for October RL maintenance diversion

[jzimbel-mbta]

Asana task: ad hoc?

The two alerts are "two sides of the same coin"—one informs southbound trips and the other northbound, because using a single alert for both directions caused problems for JFK countdown clocks.

• Tests added?

[github-actions]

Coverage of commit fffe23a

Summary coverage rate:
  lines......: 40.4% (2297 of 5692 lines)
  functions..: 41.8% (1050 of 2512 functions)
  branches...: no data found

Files changed coverage rate:
                                                                           |Lines       |Functions  |Branches    
  Filename                                                                 |Rate     Num|Rate    Num|Rate     Num
  ===============================================================================================================
  lib/screens/v2/widget_instance/dup_alert.ex                              | 0.0%     62| 0.0%    20|    -      0
  lib/screens/v2/widget_instance/reconstructed_alert.ex                    |90.4%    166| 100%    22|    -      0

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