refactor(logs): apply user attributes to log regardless of send_default_pii

[lcian]

We have decided that SDKs should ignore send_default_pii when setting user attributes on logs because that's what we do for other data types such as events.

(explanation: any integration that can set the user must honor send_default_pii, so they won't set the user if that flag is off. Then, the only way to have a user on the scope is for the Sentry user to manually set it, in which case we always want to let them do it and send the data, regardless of send_default_pii.)

Technically this is a breaking change even though it's pretty unlikely that someone is already using this.
As an alternative we could just ignore the parameter.

[codecov]

Codecov Report

Attention: Patch coverage is 15.78947% with 16 lines in your changes missing coverage. Please review.

Project coverage is 73.66%. Comparing base (0b251dc) to head (2a219f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #843      +/-   ##
==========================================
+ Coverage   73.64%   73.66%   +0.01%     
==========================================
  Files          64       64              
  Lines        7728     7726       -2     
==========================================
  Hits         5691     5691              
+ Misses       2037     2035       -2     

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.