rubocop: exclude more tap files from the top-level method cop

[apainintheneck]

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Basically, this started failing for me on my personal tap because there are some methods defined at the top-level in my Rakefile. That seems acceptable to me and since we're already ignoring all other Ruby files in the tap I figured we might as well just ignore all of them.

I tested it locally and the errors I was getting with my personal tap went away.

Errors: https://github.com/apainintheneck/homebrew-dev-utils/actions/runs/7769885195/job/21189430063?pr=38

[apainintheneck]

I wonder if we should always use Taps/**/* instead of Taps/**/*.rb to avoid situations like this.

[Bo98]

I wonder if we should always use Taps/**/* instead of Taps/**/*.rb to avoid situations like this.

Probably. I see no reason why it should be limited to .rb

[apainintheneck]

It turned out that there was only one other use of it. The other ones are all Taps/*/*/*.rb which is a little bit more specific.

[MikeMcQuaid]

Makes sense, thanks @apainintheneck!