Use the default Dangerfile config, including changelog rules

Rémy Coutablerequested to merge
use-default-dangerfile-config into master

What does this MR do and why?

The Changelog trailers are not used widely amongst GitLab projects, and they're especially useful for gems. We should take advantage of this.

This also updates the Release MR template to take advantage of the Changelog trailers.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Tiffany Rea

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