E2E: Fetch issue and mr comments in parallel threads

andreyrequested to merge
acunskis-fetch-parallel into master

What does this MR do and why?

Describe in detail what your merge request does and why.

Speed up fetching of imported issue and mr comments

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by andrey

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