matmarchand

Improve get PRs details performance

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### Azure DevOps Extensions Generate Release Notes (Node Cross Platform) ### Is your feature request related to a problem? Please describe. Generating release notes is really slow in our case...

Batch dispatching execution was not awaited but run synchronously, which may lead to thread starvation

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Single dispatching execution was awaited but not batch dispatching execution that was run synchronously, which may lead to thread starvation. Change-Id: I992c5300ab58f69c8ce138bd1d46726ccfe6c3a2