All the controller container names should be called controller

[aliok]

Problem
Image override within operator is problematic at the moment.
Some containers have the same names. Some have different name but their pattern is also different.

I proposed making all container names unique at #2794 but that looks like is not the way to go.

However, to be consistent, let's make all controller container names controller.
This is less confusing when we're doing image overrides with the operator.

Persona:
System Integrator

Exit Criteria
All containers have the same name

Time Estimate (optional):
1d

Additional context (optional)
If we agree doing this, we should also do it for serving.

cc @jcrossley3 @houshengbo

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