Load campaign data only once #1585

Job	Run time
Windows (windows-2019, Visual Studio 16 2019, Debug, Win32)	10m 44s
Linux (clang, macos-12, Debug)	10m 54s
Windows (windows-2019, Visual Studio 16 2019, Debug, x64)	12m 50s
Linux (gcc-9, ubuntu-20.04, Debug, 3.16.3, 1.71.0)	21m 3s
Windows (windows-2019, Visual Studio 16 2019, Release, Win32)	17m 50s
Linux (clang-10, ubuntu-20.04, Debug, 3.16.3, 1.71.0, true)	23m 5s
Windows (windows-2019, Visual Studio 16 2019, Release, x64)	18m 23s
Linux (gcc-10, ubuntu-20.04, Debug, true)	22m 41s
Windows (windows-2022, Visual Studio 17 2022, Debug, Win32)	9m 47s
Linux (clang-14, ubuntu-22.04, Debug, 3.22.1, 1.74.0, 17)	21m 23s
Windows (windows-2022, Visual Studio 17 2022, Debug, x64)	12m 49s
Linux (gcc-11, ubuntu-22.04, Debug, 3.22.1, 1.74.0)	18m 9s
Windows (windows-2022, Visual Studio 17 2022, Release, Win32)	18m 52s
Windows (windows-2022, Visual Studio 17 2022, Release, x64)	19m 5s
Linux (gcc-11, ubuntu-22.04, RelWithDebInfo, 3.22.1, 1.74.0)	22m 48s
Linux (gcc-12, ubuntu-22.04, Debug, 1.82.0)	23m 26s
Linux (clang-16, ubuntu-20.04, Debug, true)	25m 0s
	5h 8m 49s

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