Backport PR #1139 on branch 1.x (Raise errors on individual problematic extensions when listing extension)

[meeseeksmachine]

Backport PR #1139: Raise errors on individual problematic extensions when listing extension

[codecov]

Codecov Report

Base: 71.43% // Head: 71.35% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (f89569b) compared to base (28c9e29).
Patch coverage: 45.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x    #1141      +/-   ##
==========================================
- Coverage   71.43%   71.35%   -0.08%     
==========================================
  Files          62       62              
  Lines        7758     7765       +7     
  Branches     1536     1537       +1     
==========================================
- Hits         5542     5541       -1     
- Misses       1826     1835       +9     
+ Partials      390      389       -1     

Impacted Files	Coverage Δ
jupyter_server/extension/serverextension.py	71.62% <45.45%> (-3.56%)	⬇️
jupyter_server/extension/manager.py	92.03% <0.00%> (-0.50%)	⬇️

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