Codegen: Support empty selected operator sets

[Erik-Lundell]

Ensure generated registration sources still include the required function header when there are no selected kernels. Also keep empty selected operator YAML compatible with torchgen by emitting an empty et_kernel_metadata map instead of null.

Tested with two tests:

• Codegen a library where the selected ops don't match the kernel library, causing silent dropping of those selected ops.
• Codegen a library with no selected ops.

The intention is to avoid having to generate the
selected operator yaml at configure time to decide whether to generate and include the lib, simplifying cmake logic.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 3 New Failures, 15 Unclassified Failures

As of commit 971d0b7 with merge base adaaa8b ():

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• pull / test-coreml-bc-macos (macos-m1-stable) / macos-job (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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