C++ CI Workflow with conda-forge dependencies

Revert "Remove GZ_SINGLETON_DECLARE definition workaround (fix for ar… #1442

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Run time

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Job	Run time
[ubuntu-latest@Release@conda]	53m 3s
[windows-2019@Release@conda]	59m 50s
[macos-latest@Release@conda]	1h 27m 25s
	3h 20m 18s