api: temporarily remove the warning about sync-context in requestConnection #5738
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Contrary to #5736, we will still keep the sync-context requirement of
requestConnection(), because it prevents API fragmentation.
PickFirstLoadBalancer is the only known violator. We will fix it on
master, but we don't want to make that change on 1.21.x because the
release is soon. We simply remove the warning in this release so that
users won't be annoyed.
This supersedes #5736