Replace EXPORT_MISFIT_DATA workflow with button in the gui

[oyvindeide]

We have a workflow to export misfit data for an ensemble: https://github.com/equinor/ert/blob/d1a0f141b8e80863652a78c5a830272235f76d70/src/ert/plugins/hook_implementations/workflows/export_misfit_data.py#L14, however this would be better as a button in the gui, for example in this view:

we would also like to be able to it on the experiment level, where you can export for multiple ensembles at the same time.

We should also (just?) offer csv export so we can replace: https://github.com/equinor/fmu-drogon/blob/2567742600ff3c879e6d18e5c5331bee49715685/ert/bin/scripts/wf_export_misfit.py#L90, using that workflow should trigger a warning that there exists a button that can do the same.