fix(rumtime): disable server-timing header via options.timing

[clarkdo]

🔗 Linked issue

Fix nuxt/nuxt#15660

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)

📚 Description

timing config is for enabling bundles loading time instead of timing header, this pr is improving the accuracy of description.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #823 (ca198e1) into main (ae708f0) will increase coverage by 0.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     nuxt/framework#823      +/-   ##
==========================================
+ Coverage   69.93%   70.46%   +0.53%     
==========================================
  Files          57       57              
  Lines        5312     5316       +4     
  Branches      594      604      +10     
==========================================
+ Hits         3715     3746      +31     
+ Misses       1588     1561      -27     
  Partials        9        9              

Impacted Files	Coverage Δ
src/nitro.ts	87.77% <100.00%> (+0.56%)	⬆️
src/rollup/config.ts	91.35% <0.00%> (+0.46%)	⬆️
src/rollup/plugins/timing.ts	91.66% <0.00%> (+52.08%)	⬆️

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[pi0]

Thanks 💯 Nice idea using plugins to opt-in