Backport PR #1233 on branch 1.x (Added error propagation to gateway_request function) (#1234)

[meeseeksmachine]

Backport PR #1233: Added error propagation to gateway_request function

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +2.30 🎉

Comparison is base (a777102) 69.23% compared to head (5cc32ec) 71.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x    #1234      +/-   ##
==========================================
+ Coverage   69.23%   71.53%   +2.30%     
==========================================
  Files          62       62              
  Lines        7564     7835     +271     
  Branches     1128     1548     +420     
==========================================
+ Hits         5237     5605     +368     
+ Misses       1935     1838      -97     
  Partials      392      392              

Impacted Files	Coverage Δ
jupyter_server/gateway/gateway_client.py	68.57% <0.00%> (+3.00%)	⬆️
jupyter_server/view/handlers.py	100.00% <0.00%> (ø)
jupyter_server/services/api/handlers.py	100.00% <0.00%> (ø)
jupyter_server/terminal/api_handlers.py	100.00% <0.00%> (ø)
jupyter_server/services/config/manager.py	100.00% <0.00%> (ø)
jupyter_server/services/config/handlers.py	100.00% <0.00%> (ø)
jupyter_server/services/security/handlers.py	100.00% <0.00%> (ø)
jupyter_server/services/contents/handlers.py	86.55% <0.00%> (+0.14%)	⬆️
jupyter_server/extension/serverextension.py	71.62% <0.00%> (+0.19%)	⬆️
jupyter_server/services/sessions/sessionmanager.py	88.47% <0.00%> (+0.21%)	⬆️
... and 24 more

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