Add vac_increased_limit feature flag for 1000 tracked refs

Gregory Havengarequested to merge
ghavenga-vac-increased-limit into master

What does this MR do and why?

Adds a feature flag vac_increased_limit to allow specific projects to track up to 1000 branches/tags instead of the default limit of 2.

This enables projects like gitlab-org/gitlab to track all supported releases (last 3 releases) while we develop the full quota management system.

Implementation

When vac_increased_limit is enabled for a project:

  • Model validation (tracked_refs_limit) allows up to 1000 tracked refs
  • Frontend receives the increased limit via max_tracked_refs in the configuration presenter

How to use

Enable for a specific project:

Feature.enable(:vac_increased_limit, Project.find_by_full_path('gitlab-org/gitlab'))

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Related issues

Part of epic &3430

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