[azservicebus] Create a programmatically useful code for when a session is not available #19113
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Adding a new error Code (
CodeTimeout
) for when we get back acom.microsoft:timeout
error from Service Bus. The primary use is if we are doing anAcceptNextSessionFor<Entity>()
and there aren't any available sessions.This should allow customers to figure out if there's a genuine failure or if their session-enabled queue/subscription is simply "empty".
This also improves the tests and adds in some more customer exposed examples for reading through a a queue of sessions.
Fixes #19039