plot_interactive for MvNormal is restricted to the mean vector and the covariance/precision matrix is ignored

[aloctavodia]

See https://github.com/arviz-devs/preliz/blob/b10bfc62b55ddfe87c8e9c42f217c5a2b08af5d3/preliz/distributions/continuous_multivariate.py#L279C1-L282C14