fix(github): correct CODEOWNERS browser package paths

[overbalance]

Summary

• Fix web-common path (was incorrectly opentelemetry-web-common)
• Add missing browser-only packages: context-zone and context-zone-peer-dep

Test plan

• Paths verified to exist in repo

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.41%. Comparing base (4d70213) to head (148c459).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6303   +/-   ##
=======================================
  Coverage   95.41%   95.41%           
=======================================
  Files         317      317           
  Lines        9597     9597           
  Branches     2220     2220           
=======================================
  Hits         9157     9157           
  Misses        440      440           

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