Restructure CI to use reusable workflow (#455) #847

Job	Run time
Linux.3: static / steps	7m 17s
Linux.1: Release / steps	7m 16s
Linux.4: pkgconfig=OFF, testing=OFF, python=OFF / steps	3m 2s
Linux.2: Debug / steps	7m 12s
Linux.5: custom namespace / steps	7m 17s
Linux.6: clang / steps	7m 16s
Linux.7: vfx2023 / steps	7m 16s
macOS.1: Release / steps	1m 12s
macOS.2: Debug / steps	1m 6s
macOS.4: pkgconfig=OFF, testing=OFF / steps	40s
macOS.3: static / steps	1m 15s
macOS.5: macos-13 / steps	3m 2s
Windows.1: Release / steps	2m 22s
Windows.3: static / steps	2m 25s
Windows.2: Debug / steps	2m 24s
Windows.5: pkgconfig=OFF, testing=OFF / steps	2m 20s
Windows.6: vfx2022 / steps	2m 11s
	1h 5m 33s

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