Fix MacOS packaging scripts for r21.1

Ammar Nejatirequested to merge
a.fixR21.1 into r21.1

  • The Python script devtools/deploy/mac/mac_package.py.in is used to build the Python wheel. The same script is used to build the MacOS package (.dmg).

  • .gitlab-ci.yml is modified to make the Python wheel via the Python script.

  • The Python dependencies for building and testing are further separated.

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