task(tests): Ignore test_new_users_first_messages_dont_warn_about_insecure_device_if_it_is_secure because it is flaky

[andybalaam]

Ignores a test that is flaking, tracked here: #4871

[andybalaam]

The fixes that we tried were guesswork, and they didn't work :-(

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.87%. Comparing base (8c3f554) to head (b7f562a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4972      +/-   ##
==========================================
- Coverage   85.91%   85.87%   -0.04%     
==========================================
  Files         325      325              
  Lines       35697    35699       +2     
==========================================
- Hits        30670    30658      -12     
- Misses       5027     5041      +14     

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