Avoid using event key in uwsgi logs

[sergei-maertens]

Updated from event to msg for high-cardinality log messages, so that we can enable indexing on the event key.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.62%. Comparing base (47cde92) to head (6b711c4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #715   +/-   ##
=======================================
  Coverage   84.62%   84.62%           
=======================================
  Files         138      138           
  Lines        2738     2738           
  Branches      215      215           
=======================================
  Hits         2317     2317           
  Misses        373      373           
  Partials       48       48           

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[github-actions]

Bencher Report

Branch	chore/update-uwsgi-logs-config
Testbed	ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result milliseconds (ms) (Result Δ%)	Upper Boundary milliseconds (ms) (Limit %)
performance_test/tests/test_objects_list.py::test_objects_api_list_filter_by_object_type	📈 view plot 🚷 view threshold	119.17 ms (-1.19%) Baseline: 120.61 ms	126.64 ms (94.11%)
performance_test/tests/test_objects_list.py::test_objects_api_list_filter_one_result	📈 view plot 🚷 view threshold	22.26 ms (-1.11%) Baseline: 22.51 ms	23.63 ms (94.18%)
performance_test/tests/test_objects_list.py::test_objects_api_list_large_page_size_page_1	📈 view plot 🚷 view threshold	283.83 ms (-1.52%) Baseline: 288.22 ms	302.63 ms (93.79%)
performance_test/tests/test_objects_list.py::test_objects_api_list_large_page_size_page_5	📈 view plot 🚷 view threshold	284.81 ms (-1.46%) Baseline: 289.04 ms	303.49 ms (93.84%)
performance_test/tests/test_objects_list.py::test_objects_api_list_small_page_size_page_20	📈 view plot 🚷 view threshold	130.31 ms (-1.25%) Baseline: 131.96 ms	138.56 ms (94.05%)

🐰 View full continuous benchmarking report in Bencher