Use a queue for parallel tests instead of a group

[sirenkovladd]

Maintains steady concurrency level throughout execution
similar to fastq

https://github.com/wellwelwel/poku/blob/main/src/services/run-tests.ts#L92-L145

[wellwelwel]

@sirenkovladd, I'm working on it in #886. For now, Poku's own test suite clarifies the difference:

Linux: ~19% faster
macOS: ~21% faster
Windows: ~24% faster

• These rates can be even higher in extremely long and time-consuming tests, and can exceed 50%, helping to understand what happened in chore: use Node.js test runner tstyche/tstyche#295.

Thanks for your help, this enhancement will have a huge impact on Poku.

Note

I chose not to bring this improvement to Poku v2, as I don't intend to offer updates for this version except for security patches (until version 3 is officially released).