🐛 Fix panic when using embedded type aliases

[tsaarni]

This pull request is NOT to be merged!

Controller-gen panics when parsing an embedded/inline struct that uses a type alias. This PR includes a test to reproduce the problem, however the panic only happens when type aliases are enabled so the test needs to be run like this in order to trigger panic

$ go version
go version go1.23.2 linux/amd64
$ cd pkg/crd/testdata
$ GODEBUG=gotypesalias=1 go generate

PR also includes a workaround for the panic that I found while troubleshooting the issue. It avoids panic but it isn’t the correct solution. As of now, I don't know how to do it properly, so I'm marking this PR as a Draft.

Fixes #1088

[k8s-ci-robot]

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This pull-request has been approved by: tsaarni
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[k8s-ci-robot]

Hi @tsaarni. Thanks for your PR.

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