Preparation MR cleanup
f89bce1e - Simplify Prep MR titles
There wasn't enough benefit to saying "11.7 RC7" instead of "11.7.0-rc7" to justify the complexity of two additional methods.
55c33c0f - Use project.path
over repo_ce_or_ee
Project already contains the info we need, so that's one less method!
f3420bd3 - Simplify Prep MR summary
f3279977 - Link to patch issue for RC prep MRs
Previously, we were linking to the monthly release issue, which for these purposes is less useful than linking to the RC's task issue.