Make the module.workspace=off as default

[bep]

See golang/go#51967

I suspect not many Hugo users use this feature, but if they do, I think the default behaviour is confusing. Having a go.work file in the project used for development purposes and add that to your .gitignore file would make for a great dev setup, but it would be a pain to have to remember turning it off.

Setting module.workspace=off would enable the best of both worlds:

• Default would work great for development.
• Any other use cases could be configured.

[UtkarshVerma]

This would be a considerable improvement upon current state where module.workspace only accepts the absolute path.

Maybe having the following logic for the config would make sense?

1. off by default
2. on would tell Hugo to look for go.work in the project
3. <absolute or relative path> would tell Hugo to use the workspace file at that path.

I can't think of any use case for the third case right now, so it could probably be dropped.

[github-actions]

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