Option to enter a different commit message when applying suggestions

Problem to solve

Auto-generated commit messages when applying suggestions might not work as well. For example below commit message conflicts with gitlab-ce's Danger rule of having short commmit subjects.

Apply suggestion to ee/spec/services/design_management/save_designs_service_spec.rb

Intended users

Developer

Further details

Proposal

Allow developer to enter a different commit message when applying suggestions.

Permissions and Security

Documentation

Testing

What does success look like, and how can we measure that?

Links / references