QQ: handle aux state upgrades from aux v1. (backport #16990)#17000
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If this isn't done and a system is upgraded as: 3.13 -> 4.2 -> 4.3
then the aux state will initialise as aux v1 which the current version
of rabbit_fifo.erl does not handle. The aux state will never be
upgraded and thus the queue(s) will never emit metrics or take
snapshots.
(cherry picked from commit 99c968a)
It mimics existing tests for v1 => v2 and v2 => v3. (cherry picked from commit 61e3aa8)
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If this isn't done and a system is upgraded as: 3.13 -> 4.2 -> 4.3
then the aux state will initialise as aux v1 which the current version
of rabbit_fifo.erl does not handle. The aux state will never be
upgraded and thus the queue(s) will never emit metrics or take
snapshots.
Fixes #16974
This is an automatic backport of pull request #16990 done by [Mergify](https://mergify.com).