Merge topic 'ci-package-pipeline'

7c60a2625d gitlab-ci: Optionally upload release packages to custom URL
fc8a981893 gitlab-ci: Generalize package and help upload URLs
f73649823b gitlab-ci: Stage unsigned release package artifacts in a dedicated directory
0929221ca3 gitlab-ci: Simplify Windows packaging pipeline
ce2e825306 gitlab-ci: Simplify macOS packaging jobs
05531a7c4e gitlab-ci: add pre-build and post-build steps to Windows
5ab92d8e71 gitlab-ci: add pre-build and post-build steps to macOS

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !8266