Fix: Set a non-zero polling internal when inotify cannot import

[stumpylog]

Proposed change

Takes a chain:

1. INotify import fails
2. polling is set to 0 by default
3. End up polling at 0 interval, using CPU forever

To prevent that, log a warning if inofity doesn't import, and reset to a default 10s polling interval if we reach polling with a 0 interval

Fixes #4226

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain):

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

Merging #4230 (7fd0596) into dev (1ce0eae) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #4230   +/-   ##
=======================================
  Coverage   95.42%   95.42%           
=======================================
  Files         344      344           
  Lines       13198    13199    +1     
  Branches     1076     1076           
=======================================
+ Hits        12594    12595    +1     
  Misses        599      599           
  Partials        5        5           

Flag	Coverage Δ
backend	94.22% <100.00%> (+<0.01%)	⬆️
frontend	96.85% <ø> (ø)

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Files Changed	Coverage Δ
...documents/management/commands/document_consumer.py	94.02% <100.00%> (+0.02%)	⬆️

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[shamoon]

Thanks!

[github-actions]

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