Add tile endpoint for CMIP6

[abarciauskas-bgse]

CMIP6 is broken in the current dashboard because, I think, changes were made to use the tileApiEndpoint for zarr dataset layers.

tileApiEndpoint is marked as an optional parameter but I wonder if it should actually be required.

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[abarciauskas-bgse]

https://deploy-preview-398--visex.netlify.app/data-catalog/combined_CMIP6_daily_GISS-E2-1-G_tas_kerchunk_DEMO/explore - tiles are now showing up as expected 🎉

[dzole0311]

Thanks @abarciauskas-bgse, I tested this and it works as expected. I think we could go ahead and merge this so it could be part of the deployment later today.

I also opened a follow-up on the UI side as I think we have two options here. We could either always provide the tileApiEndpoint and the stacApiEndpointas part of the deployments secrets so that we could fallback unto if they are not provided via the MDX (ie. tileApiEndpoint ?? process.env.API_XARRAY_ENDPOINT). The second option is to make them required in the MDX.

@hanbyul-here @sandrahoang686 Any opinions here?