Properly aggregate HTML report from multiple workers

[DenysKuchma]

Problem

HTML report was broken with CodeceptJS workers - each worker created its own report causing data loss.

Solution

Added worker_threads.isMainThread detection to HTML pipe:

• Workers save tests to temp JSONL files
• Main thread loads and aggregates all worker files
• Generates single HTML report with all test data
• Uses official Node.js API, no adapter changes needed

[codeant-ai]

User den.kuchma@ukr.net does not have a PR Review subscription.

Go to Team management and add this email to the PR Review subscription.

[DavertMik]

Use worker subscriber-dispatcher Workers API

[olexandr13]

this code is not clear
please divide it into separate function
I would like to undestand the logic by observing the code, but now I should dive deep

[DenysKuchma]

Better way to fix here: codeceptjs/CodeceptJS#5464