Danger to fail backport MRs without descriptive title

Jenny Kimrequested to merge
jk/danger-validate-backport-mr-title into master

What does this MR do and why?

This MR is to put the check for a descriptive title for backport MRs. We have this suggestion in the backport MR template, but it's not enforced.

Having a descriptive stable branch MR is important, because the titles get listed in the release blog posts.

References

gitlab-com/gl-infra/delivery#21377 (closed)

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