fix: Make ExtensionRunner#closeBrowser optional

[aklinker1]

Overview

Broken out of #2081

Manual Testing

CI passes.

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commit: 1f352da

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.10%. Comparing base (1fe0730) to head (1f352da).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/wxt/src/core/create-server.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2092      +/-   ##
==========================================
+ Coverage   76.03%   76.10%   +0.07%     
==========================================
  Files         113      113              
  Lines        3050     3047       -3     
  Branches      686      686              
==========================================
  Hits         2319     2319              
+ Misses        648      644       -4     
- Partials       83       84       +1     

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