Deprecate XarrayZarrRecipe manual stage functions

[cisaacstern]

Just a note to self to follow through on

https://github.com/pangeo-forge/pangeo-forge-recipes/blob/3a63f2ea8bd86936a7731c6cc8c1cfe9eed720b4/pangeo_forge_recipes/recipes/xarray_zarr.py#L689

And to remember that this will require docs changes in

• https://github.com/pangeo-forge/pangeo-forge-recipes/blob/master/docs/recipe_user_guide/execution.md#manual-execution
• https://github.com/pangeo-forge/pangeo-forge-recipes/blob/master/docs/tutorials/xarray_zarr/netcdf_zarr_sequential.ipynb

(and maybe others places) as well.

[cisaacstern]

Another place this needs to be changed is referenced in https://github.com/pangeo-forge/staged-recipes/issues/128#issuecomment-1078525149

[cisaacstern]

Following 0.10.0 release, XarrayZarrRecipe no longer exists, so closing.