C++ CI Workflow with conda-forge dependencies

Add missing `ContinuousDynamicalSystem` row to `Exported components` in the README #5014

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Run time

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Job	Run time
[ubuntu-latest@Release@conda]	2m 23s
[windows-2019@Release@conda]	8m 2s
[macos-latest@Release@conda]	8m 46s
	19m 11s