Add `memory_profiler` and `derailed_benchmarks`
What does this MR do?
First iteration of https://gitlab.com/gitlab-org/gitlab-ce/issues/62270.
Adds gems, but does not load them yet. Makes it easier to run memory profiling when needed.
First iteration of https://gitlab.com/gitlab-org/gitlab-ce/issues/62270.
Adds gems, but does not load them yet. Makes it easier to run memory profiling when needed.