Allow adding "skip news" about blurb_it HOT 5 CLOSED

I think comitter should decide news is required or not.
I don't ignore PRs only because red cross.

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Many docs-related PRs don't require news file. If a contributor just created a blurb file with not meaningful info, it is more difficult to remove the file (from within GitHub UI), but removing a label is easy.

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I think comitter should decide news is required or not.

The committer should decide but PR author should be able to propose. Just like the committer decides what gets merged but the PR author proposes the patch.

I don't ignore PRs only because red cross.

Maybe you don't, but at least @willingc said "In other projects that I maintain, I rarely look at a PR that does not have a green checkmark" (https://discuss.python.org/t/github-labels-and-pr-review-workflow/237)

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I personally think it is ok for non-committer to apply the skip news label to pass the CI.
If a core dev disagrees, it is quite easy to remove the label.

blurb-it (GitHub App) might not have the permission to add label. We might need to do this using bedevere's OAuth token.

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This might be easier with bedevere: python/bedevere#175

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