cc_proto_library returns headers in both _virtual_includes and _virtual_imports

### Description of the bug:

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### Which category does this issue belong to?

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### What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

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### Which operating system are you running Bazel on?

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### What is the output of `bazel info release`?

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### If `bazel info release` returns `development version` or `(@non-git)`, tell us how you built Bazel.

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### What's the output of `git remote get-url origin; git rev-parse HEAD` ?

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### If this is a regression, please try to identify the Bazel commit where the bug was introduced with bazelisk --bisect.

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### Have you found anything relevant by searching the web?

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### Any other information, logs, or outputs that you want to share?

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