Handle mc_amqp 3.13 msg record in 4.x (backport #13435)
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The `msg` record was used in 3.13. This commit makes 4.x understand
this record for backward compatibility, specifically for the rare case where:
1. a 3.13 node internally parsed a message from a stream via
```
Message = mc:init(mc_amqp, amqp10_framing:decode_bin(Bin), #{})
```
2. published this Message to a queue
3. RabbitMQ got upgraded to 4.x
(This commit can be reverted in some future RabbitMQ version once it's
safe to assume that these upgraded messages have been consumed.)
The changes were manually tested as described in Jira RMQ-1525.
(cherry picked from commit 91f5ce2)
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The
msgrecord was used in 3.13. This commit makes 4.x understand this record for backward compatibility, specifically for the rare case where:(This commit can be reverted in some future RabbitMQ version once it's safe to assume that these upgraded messages have been consumed.)
The changes were manually tested as described in Jira RMQ-1525.
This is an automatic backport of pull request #13435 done by [Mergify](https://mergify.com).