Move pipeline limits to Core

Release Notes

Pipeline Creation Limits are available in GitLab FOSS (Core)

Problem

Limits related to pipeline creation such as Chain::Limit::Size, Chain::Limit::Activity and Chain::Limit::JobActivity are defined on GitLab EE codebase but not in Core. Originally these features were designed for GitLab EE but then we added PlanLimits class that also supports managing application limits for default plans (projects in Core and self-hosted).

These limits, implemented as of today, are available on GitLab EE installation (without license) but not in GitLab FOSS (Core).

Solution

We should move these to Core.