Dynamic Shovels: support old (pre-3.13.0, 3.12.8) and new supervisor child ID formats (backport #9909)

[mergify]

This is an automatic backport of pull request #9909 done by Mergify.
Cherry-pick of 2ce0307 has failed:

On branch mergify/bp/v3.12.x/pr-9909
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	both modified:   deps/rabbitmq_shovel/src/rabbit_shovel_dyn_worker_sup_sup.erl

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[michaelklishin]

@gomoripeti this backport PR is ready for another round of QA.

[michaelklishin]

According to my tests that performed a rolling upgrade of three cluster nodes from 3.12.6 to this version of 3.12, the exception is gone and Shovels function as expected.