as_tibble() checks column length twice

[krlmlr]

even with validate = FALSE. This seems unnecessary.

[anhqle]

So do we make the validate_nrow check from new_tibble optional?

This preserves the ability to validate_nrow for authors who use new_tibble to extend tibble, while allowing us to skip validate_nrow in as_tibble.

PR below.

[github-actions]

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