Collapse config change triggers into the main DC controller

[0xmichalis]

Once #13242 is merged, we can move the CCT mechanism from the deployment trigger controller into the main DC controller and switch the former controller off.

[0xmichalis]

The blue peak is 400s from instantiate as per @smarterclayton. Those are coming from the deployment trigger controller most likely (what else). This issue should fix that peak so I am adding this to the 3.7 milestone.

[0xmichalis]

Those are API server errors during the 3.5->3.6 upgrade of devpreview btw

[0xmichalis]

@mfojtik this is the issue I mentioned today. 400s by instantiate is the #1 error coming from our API server. Collapsing the deployment trigger controlller in the main controller, ought to fix it since we will stop using instantiate in the controller.

[mfojtik]

+1 we have to fix this, on my 3.7 list

[0xmichalis]

Fixed by #14910 🎉