Add Msg.failed_reason

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #391 (756b32f) into main (99c9b6a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #391   +/-   ##
=======================================
  Coverage   71.56%   71.56%           
=======================================
  Files          94       94           
  Lines        8269     8269           
=======================================
  Hits         5918     5918           
  Misses       1754     1754           
  Partials      597      597           

Impacted Files	Coverage Δ
backends/rapidpro/msg.go	68.39% <ø> (ø)
backends/rapidpro/status.go	56.09% <ø> (ø)

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