Fix handling of control flow instructions in convert_to_target() (backport #11877)

[mergify]

This is an automatic backport of pull request #11877 done by Mergify.
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Changes to be committed:
	new file:   releasenotes/notes/fix-control-flow-convert-to-target-ae838418a7ad2a20.yaml
	modified:   test/python/providers/test_fake_backends.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   qiskit/providers/backend_compat.py

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[jakelishman]

I'm just going to close this as a backport PR: I think we need a specific PR targetted at 0.46 (and to verify that it's a problem on 0.46 at all) because every part of this function and the testing infrastructure changed between 0.46 and 1.0.