Disable floating point exceptions on some tests

Running tests with e.g., `xvfb-run` triggers floating point exceptions
which make the tests fail. This commit adds the
`DISABLE_FLOATING_POINT_EXCEPTIONS` option to some
`vtk_test_cxx_executable` macro calls to fix this issue. For reference
look at https://discourse.vtk.org/t/running-tests-with-xvfb-run/7597

This also adds release notes for disabling fpe on testing.