fix: honor --auth option

[pieh]

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Summary

Fixes https://linear.app/netlify/issue/FRB-1343/internal-server-error-on-netlify-builds-via-bitbucket-pipeline-missing

Our --auth CLI option handling seems a bit hit and miss. We had a lot of optional argument and @ts-expect-error around code that was dealing with tokens - this removes all of those, adjust types to require token from CLI toggle being passed in to helper functions (do note that this doesn't fully ensure type safety, because options.auth has type any, but at least it ensures that something is passed in instead of being optional)

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[serhalp]

@pieh is this something we want to get over the finish line?

[pieh]

This got really outdated and has so many merge conflicts that is not worth keeping open. There is a workaround with NETLIFY_AUTH_TOKEN=$NETLIFY_AUTH npx netlify deploy --build, so I'll close this PR to clean up PR list.