Configurable pr titles for manifest releases in a monorepo with many components

Thanks for stopping by to let us know something could be better!

**Is your feature request related to a problem? Please describe.**

As a developer I want to be able to control the pr titles that release please generates for all of my components in a monorepo

**Describe the solution you'd like**

I want the configuration option that works for single package repositories to also work for monorepos with many components instead of the default which is `chore($branch_ref) release "$group" libraries` for linked components and `chore($branch_ref) release $component $version` for non linked components

**Describe alternatives you've considered**

If I even try to set the option it causes release-please to malfunction so there are no other alternatives

**Additional context**