Disallow newlines in reason (#9167)

[Dreamsorcerer]

(cherry picked from commit 88f3834)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.79%. Comparing base (1856c59) to head (29acbcc).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9199   +/-   ##
=======================================
  Coverage   97.79%   97.79%           
=======================================
  Files         108      108           
  Lines       34572    34580    +8     
  Branches     4127     4130    +3     
=======================================
+ Hits        33808    33817    +9     
  Misses        571      571           
+ Partials      193      192    -1     

Flag	Coverage Δ
CI-GHA	97.68% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.36% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.94% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.05% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.14% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	?
Py-3.10.15	97.07% <100.00%> (?)
Py-3.11.10	96.98% <100.00%> (+0.18%)	⬆️
Py-3.11.9	97.05% <100.00%> (-0.19%)	⬇️
Py-3.12.5	?
Py-3.12.6	97.40% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.56% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.86% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.04% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	?
Py-3.9.20	96.98% <100.00%> (?)
Py-pypy7.3.16	96.58% <100.00%> (+<0.01%)	⬆️
VM-macos	97.05% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.36% <100.00%> (+<0.01%)	⬆️
VM-windows	94.94% <100.00%> (+<0.01%)	⬆️

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