chore(log): do not exec file handler examples in CI

[kt3k]

std/log/file-handler examples generate logs.txt and it makes the repository modified state. That leads to the publishing failure https://github.com/denoland/std/actions/runs/11815536146/job/32916891866

This PR fixes the situation by ignoring examples in doc testing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (c6193ac) to head (88616a9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6183      +/-   ##
==========================================
- Coverage   96.49%   96.10%   -0.39%     
==========================================
  Files         535      516      -19     
  Lines       41285    41127     -158     
  Branches     6165     6086      -79     
==========================================
- Hits        39836    39527     -309     
- Misses       1405     1547     +142     
- Partials       44       53       +9     

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[satyarohith]

👍