Merge topic 'productbuild-rootVolumeOnly' into release-3.23

2a8df7e7db productbuild: Don't write rootVolumeOnly attribute if writing domains
95eb8cbcfc CPack: Avoid space / tab mix in productbuild distribution.xml template
28fdc3a536 productbuild: Simplify internal CPACK_PRODUCTBUILD_DOMAINS usage

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !7092