Port "ignore nonexistent queue" functionality to release/5.0#8155

Merged

MattGal merged 2 commits intodotnet:release/5.0from

MattGal:arcade-8061-release-5.0

Nov 11, 2021

Commits on Nov 8, 2021

In preparation of removing deadlettered queues, teach the SDK to optionally ignore when a queue does not exist.
MattGal
committed

Commits on Nov 9, 2021

Over-cherry-pick; XUnit reporter still lives in 5.0, don't remove the property.
MattGal
committed