[Tidy] Make changelog not required for docs changes and tidy licence files

[antonymilne]

Description

At the moment, any PR that touches files inside vizro-core or vizro-ai requires a new changelog fragment there. This is annoying for people who just want to make quick and easy docs changes (which never need a changelog entry) and also awkward with our current CODEOWNERS setup.

I've changed the logic so that if no file outside docs has been touched then the changelog fragment shouldn't be required any more.

I haven't been able to test this out fully, so there's definitely a chance my GHA/Bash scripting is slightly wrong, but we'll find out as soon as we make PRs. @stichbury this should hopefully make your life a bit easier since it means you don't need to run hatch run changelog:add any more and if someone else modifies only docs then your approval should be all that's needed to satisfy the CODEOWNERS requirement.

Also made all licence files .txt format (previously one was .md but it actually wasn't written in .md) and copied the text straight off https://www.apache.org/licenses/LICENSE-2.0.txt. It's the same text as before, just slightly different indentation. Is this what you were referring to in standup @petar-qb?

Notice

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[stichbury]

Yay! Thanks for this. I won't approve it as I don't know anything about the code but 👍 from me.

[petar-qb]

GHA changes look good. 🎉

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Is this what you were referring to in standup @petar-qb?

Yes, exactly. Thanks for adjusting that. 👍