ref(logs): enable logs by default if logs feature flag is used

[lcian]

Description

This enables log by default if the crate is used with the logs feature flag.
Otherwise, the user would have to enable the feature flag and then set enable_logs on top.

---

Note

Sets ClientOptions::enable_logs default to true under the logs feature and documents the behavioral change.

• Core:
  • Set sentry-core/src/clientoptions.rs ClientOptions::enable_logs default to true (when logs feature is enabled).
• Docs/Changelog:
  • Add Unreleased entry documenting the new default and that tracing/log integrations send structured logs at ≥ INFO by default when logs is enabled.

^{Written by Cursor Bugbot for commit a4aa065. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.71%. Comparing base (d9cdf34) to head (a4aa065).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #910      +/-   ##
==========================================
+ Coverage   73.46%   73.71%   +0.25%     
==========================================
  Files          64       64              
  Lines        7518     7518              
==========================================
+ Hits         5523     5542      +19     
+ Misses       1995     1976      -19