**What this PR does / why we need it**:

In a 1.8.x master with --leader-elect=false, the garbage collector controller
does not work.

When deleting a deployment with v1meta.DeletePropagationForeground, the deployment
had its deletionTimestamp set and a foreground Deletion finalizer was added,
but the deployment, rs and pod were not deleted.

This is an issue with how the garbage collector graph_builder behaves when the
stopCh=nil.  This PR creates a dummy stop channel for the garbage collector controller (and other
controllers started by the controller-manager) so that they can work more like they do when
when the controller-manager is configured with --leader-elect=true.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes kubernetes#57044

**Special notes for your reviewer**:

**Release note**:
<!--  Write your release note:
1. Enter your extended release note in the below block. If the PR requires additional action from users switching to the new release, include the string "action required".
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```release-note
Garbage collection doesn't work when the controller-manager uses --leader-elect=false

```