fix: prevent sentry errors for on premise subscriptions

[matthewelwell]

Changes

Changes the log message to warning to stop sending events to Sentry when an on-premise enterprise subscription is created in Chargebee.

How did you test this code?

Updated unit test.

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

Uffizzi Preview deployment-40423 was deleted.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a0eefdd) 95.64% compared to head (76f1066) 95.64%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2948   +/-   ##
=======================================
  Coverage   95.64%   95.64%           
=======================================
  Files        1012     1012           
  Lines       29154    29182   +28     
=======================================
+ Hits        27883    27911   +28     
  Misses       1271     1271           

Files	Coverage Δ
api/organisations/tests/test_views.py	100.00% <100.00%> (ø)
api/organisations/views.py	91.39% <100.00%> (ø)

... and 2 files with indirect coverage changes

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