Netlify builds happen for PRs that do not change docs

Bug report

After #92852 all PRs get a notification from netlify about new doc builds. Example: #100070 (notice no Doc/ changes made)

I don't think it is right:

1. We are wasting resources for no good reason
2. It is a noise for both contributors and core devs

But, netlify has build.ignore option that can work similarly to these lines:

Docs: https://docs.netlify.com/configure-builds/ignore-builds/

I will send a PR to test it :)

Linked PRs

• gh-100072: only trigger netlify builds for doc changes #100074