Backport #981: Make it easier to pass custom env variables to kernel

[divyansshhh]

No description provided.

[codecov-commenter]

Codecov Report

Base: 71.43% // Head: 71.52% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (ba2f17f) compared to base (507c697).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x     #994      +/-   ##
==========================================
+ Coverage   71.43%   71.52%   +0.08%     
==========================================
  Files          62       62              
  Lines        7738     7741       +3     
  Branches     1286     1283       -3     
==========================================
+ Hits         5528     5537       +9     
+ Misses       1821     1813       -8     
- Partials      389      391       +2     

Impacted Files	Coverage Δ
jupyter_server/services/sessions/sessionmanager.py	88.47% <100.00%> (+0.16%)	⬆️
jupyter_server/services/kernels/kernelmanager.py	80.58% <0.00%> (+1.94%)	⬆️

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[blink1073]

Thanks!

[kevin-bates]

Thanks @divyansshhh and @blink1073!