ref: cleanup unused code after merge

[Flash0ver]

I believe we were left with some now unused code after merges between

• Implement process and instance isolation #4498
• chore: Setup logging only once #4706

Removing code again from SentryOptions, that was removed in #4498, but accidentally restored in #4706.

[Flash0ver]

@sentry review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.72%. Comparing base (7cabf7c) to head (8fa1ef4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4748      +/-   ##
==========================================
+ Coverage   73.66%   76.72%   +3.05%     
==========================================
  Files         476      386      -90     
  Lines       17449    14657    -2792     
  Branches     3455     2959     -496     
==========================================
- Hits        12854    11245    -1609     
+ Misses       3747     2705    -1042     
+ Partials      848      707     -141     

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