Add `metadata_only` param to `.to_zarr`?

Is your feature request related to a problem?

A leaf from https://github.com/pydata/xarray/issues/8245, which has a bullet:

compute=False is arguably a less-than-obvious kwarg meaning "write metadata". Maybe this should be a method, maybe it's a candidate for renaming? Or maybe make_template can be an abstraction over it

I've also noticed that for large arrays, running compute=False can take several minutes, despite the indexes being very small. I think this is because it's building a dask task graph — which is then discarded, since the array is written from different machines with the region pattern.

Describe the solution you'd like

Would introducing a metadata_only parameter to to_zarr help here:

• Better name
• No dask graph

Describe alternatives you've considered

No response

Additional context

No response

Start by locating the .to_zarr entry point and the tests covering compute=False. Compare the proposed metadata_only behavior with the existing metadata-writing path, including whether a Dask task graph is built. Done should be defined as an agreed API and behavior that writes metadata without constructing the unnecessary graph.