Fix hang in incremental assign during close #4528
Merged
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While using the cooperative assignor, given an assignment is received while closing the consumer
it's possible that it gets stuck in state WAIT_ASSIGN_CALL, while the method is converted to
a full unassign. Solved by changing state from WAIT_ASSIGN_CALL to WAIT_UNASSIGN_CALL
while doing this conversion.
Fixes #4527