Fix merge request factory branch names
What does this MR do and why?
Default merge request factory has confusing branch names. Other traits in the factory have correct logic in branch names. So here I update default factory to use common use-case branch names.
Source branch is where modified code is stored
Target branch is where the code should be merged to.
No user facing changes here. Pure specs update
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.