Add missing_formula require to Homebrew::CLI::NamedArgs

[ah91086]

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5 days ago we merged a PR that reworked requires, but that has led to some unhandled errors, namely: Error: uninitialized constant Homebrew::CLI::NamedArgs::MissingFormula within Homebrew::CLI::NamedArgs as raised by #17807.

This re_adds the require to address the uninitialized constant.

[apainintheneck]

The fix looks good here and works for me locally.

[apainintheneck]

I suspect that this might rollback a lot of the performance gains from the original PR. It's more important to fix a bug than worry about that now though.

CC: @MikeMcQuaid in case you know of a better way of handling this.

[MikeMcQuaid]

CC: @MikeMcQuaid in case you know of a better way of handling this.

Yup, opened #17855 for this.