Revert "CPack: Add support for code signing of bundles on MacOS"

This reverts commit 1a9b066845f8923d6652235ba2217d2d4c9463d5.
It fails tests because missing 'codesign' is an error even
when not used.  It will have to be revised.
Merge topic 'cpack-osx-codesign' into next

72455bd2 Revert "CPack: Add support for code signing of bundles on MacOS"