Fix IAsyncEnumerable SkipLast for count = 0#1782

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thibault-reigner wants to merge 4 commits intodotnet:mainfrom

thibault-reigner:fix_asyncenumerable_skiplast

Commits on Jun 23, 2022

Fix bug in SkipLast(0) for custom sequence (try to dequeue from empty queue)
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Better fix for IAsyncEnumerable.SkipLast, match algorithm of IEnumerable.SkipLast
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Commits on Jun 25, 2022

Restore configureAwait false
thibault-reigner
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Commits on Sep 8, 2022

(PR review) Revert change to SkipLast.Core + add Wrap method which actually hides an async sequence identity
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