xds: fix ring-hash-picker behaviour (1.46.x backport) #9096
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ringHashPicker changes per gRFC: grpc/grpc#29332:
previously it appears the picker logic is wrong, e.g. not request connecting on the any subchannel if it is in TRANSIENT_FAILURE
Refactored the logic to mirror the pseudo-code more so easier to understand.
backport of #9085