metafiles: copy all license files

[Rylan12]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
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• Have you successfully run brew style with your changes locally?
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Relates to Homebrew/homebrew-core#60066

Metafiles.copy? now returns true for any file that starts with license. (or copying., copyright., licence.) . This means that files like COPYING.LESSER will be copied while they wouldn't be copied in the past.

I'm not sure if there are other license filename conventions we should include here as well.

Closes #8256

[reitermarkus]

There is already a similar PR here: #8256

[Rylan12]

Thanks. Missed that...

I mentioned this issue there but I'm keeping this open for now as that PR hasn't been touched in a few weeks.

[MikeMcQuaid]

Makes sense, thanks @Rylan12! I marked this as closing #8256 as it was failing CI and had no response.

[Rylan12]

Thanks! I may open a follow up later to catch the LICENSE- case that was going to be fixed by #8256