Add a custom commit message when applying batched suggestions
Problem to solve
I noticed @jerasmus started work on this on !49102 (closed) a few months ago, but that MR was closed. I couldn't find an open issue tracking that feature, so I'm opening this one to make sure it doesn't get lost.
User experience goal
This matters for my team's workflow since we have a custom update hook that requires commit messages to have a certain format. (The project-wide merge suggestion commit message template isn't adequate for this, since our custom update hook requires the corresponding issue number, which isn't one of the available variables for that template.)
Permissions and Security
- Same permissions as for writing a custom commit message for a single suggestion
- Mention in a new subsection of https://docs.gitlab.com/ee/user/discussions/#suggest-changes