Enable Auto DevOps instance-wide on GitLab.com

Description

Add a feature flag that rolls out "Auto DevOps on by default" so that we can do a percentage of projects rollout of Auto DevOps being enabled by default.

Links

• Auto DevOps++: https://gitlab.com/gitlab-org/gitlab-ce/issues/38366
• Implications on cost and stability of GitLab.com when introducing implicit Auto DevOps: https://gitlab.com/gitlab-com/infrastructure/issues/2632

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