Fix Baynes Sound AGRIF figure (#326)

* Replace the bathymetry URL with a grid repo path

Replaced the bathymetry URL reference in the Baynes Sound AGRIF figure
configuration with a local grid path because the V17-02 bathymetry dataset has
been removed from the ERDDAP server. Adjusted related test cases and updated the
figure development and testing notebooks to align with the new configuration.

* Use h5netcdf engine for xarray dataset loading

The change ensures consistent use of the h5netcdf engine when opening datasets
with xarray. This improves compatibility and aligns with recommended practices
for handling NetCDF files in the workflow.

* Fix array handling in contour level calculation

Previously, the contour level calculation used non-scalar types directly,
causing errors. Added `.values` to ensure proper handling of scalar values
extracted from xarray objects. This issue arose with the change to `numpy>=2`.

config/nowcast.yaml

@@ -538,8 +538,6 @@ erddap:
 figures:
   # ERDDAP dataset URLs
   dataset URLs:
-    bathymetry:
-      https://salishsea.eos.ubc.ca/erddap/griddap/ubcSSnBathymetryV17-02
     HRDPS fields:
       https://salishsea.eos.ubc.ca/erddap/griddap/ubcSSaSurfaceAtmosphereFieldsV23-02
     tide stn ssh time series: