cmake: Remove outdated osxbundle files

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These files have been superseded by files in CI/scripts/macos. They are
no longer used, and keeping them around creates confusion and makes
people think they are still used. Let's remove them to prevent further
confusion.

This commit also removes the CMake function `obs_finish_bundle` that was
only used with the osxbundle resources and removes calls to that
function.

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