Replace use of multierror libraries with now standardised errors.Join

[simonwo]

errors.Join preserves the tree of errors by producing structures with Unwrap() []error calls available whereas multierr{or} only produces a linear chain of errors using Unwrap() error calls. This is a largely mechanical change using find/replace.

This is necessary for subsequent work to returned properly structured errors from the API and show them in the CLI.

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[wdbaruni]

I just want to point out that the output is different from both libraries as shown below:

Using errors.Join with two errors

name cannot be empty
email is invalid

Using multierror

2 errors occurred:
	* name cannot be empty
	* email is invalid

https://go.dev/play/p/HnrDQGUpZmX?v=goprev

[simonwo]

Yes, it's true. In the next commits I'll introduce a better mechanism for printing errors in the CLI, which will look more like the latter example. So if you want me to close this PR and merge it in with that work, I can do that.