Tests

Add cell volume and areas #6058

Job	Run time
Fedora	9m 41s
Shared, release	8m 51s
Debug, shared	8m 37s
Optimised, static	8m 52s
PETSc unreleased, ADIOS2, 3D metrics	8m 26s
Shared, OpenMP, 3D metrics	8m 53s
Default options, Ubuntu 22.04	4m 42s
	58m 2s

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