Report worker script failures through map error events

[NearlCrews]

What changed

• forward worker error and messageerror events through the dispatcher to the map
• preserve the configured worker URL so diagnostics identify the failing script
• include bundler configuration guidance for worker load and execution failures
• remove worker listeners when the dispatcher is removed
• add dispatcher, worker factory, and map event regression coverage

Fixes #8018.

Verification

• Focused unit tests: 3 files, 96 tests
• Type-check
• ESLint on every changed TypeScript file
• git diff --check

Launch Checklist

• These changes do not include backports from Mapbox projects.
• Tests cover the new behavior.
• No public API changes are introduced.
• No visual changes are introduced.
• No benchmark-adjacent code is changed.
• A CHANGELOG.md entry is included.
• I have read the project contribution policy.

[NearlCrews]

Disclosure per the project contribution policy: Generated-By: OpenAI Codex (GPT-5).

[HarelM]

Make sure that there's no open PR on this already when using AI.

• Report worker script load failures #8024

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.28%. Comparing base (2a940c1) to head (97ef769).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8156      +/-   ##
==========================================
- Coverage   93.28%   93.28%   -0.01%     
==========================================
  Files         301      301              
  Lines       25081    25104      +23     
  Branches     6578     6582       +4     
==========================================
+ Hits        23397    23418      +21     
- Misses       1684     1686       +2     

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[NearlCrews]

You are right. I missed #8024 before opening this. I compared the implementations: this branch leaves WorkerPool unchanged and attaches error and messageerror listeners in Dispatcher, but it still overlaps the same issue. I am closing it to avoid duplicate review. The all-green branch remains available if the narrower approach is useful for #8024.