Fallback new file type to file for contents put

[a3626a]

This changes allow new file type can be saved by contents put request.
I think this should be fixed during #895.

Related Issue:
#884

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.51%. Comparing base (4604ce0) to head (3e69993).
Report is 334 commits behind head on main.

Files with missing lines	Patch %	Lines
jupyter_server/services/contents/handlers.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1013      +/-   ##
==========================================
- Coverage   72.59%   72.51%   -0.08%     
==========================================
  Files          64       64              
  Lines        8249     8251       +2     
  Branches     1256     1257       +1     
==========================================
- Hits         5988     5983       -5     
- Misses       1847     1852       +5     
- Partials      414      416       +2     

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[blink1073]

Thanks!

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