Ability to customise default merge request title

Description

Ability to customise default merge request title.

We want to give default name in title box.["branchname:"] Please see the screen shot, i want the "branchname:" in title automatically.

Proposal

Provide the ability to customise the default merge mequest title. Currently this is the last commit message title, this could be changed to "branch" title for example.

Links / references

• https://gitlab.zendesk.com/agent/tickets/41442