Class-based reconcilers can't be hosted in one binary with HA

/kind bug

## Expected Behavior

I can host as many class-based controllers (for example: Ingress reconcilers) as I want in a binary, as long as the classes don't clash.

## Actual Behavior

They try to get the same lease and thus only one really works. This is quite similar to #1979.

## Steps to Reproduce the Problem

1. Create a binary that launches two Ingress reconcilers
2. Launch it and see how it competes for the lease.

## Additional Info

This is quite similar to #1979.

I guess the simplest way of fixing it is adding the class filter to the lease name.

Start by reproducing the problem with two Ingress reconcilers in one binary and trace how each lease name is derived. Done means class-based reconcilers with different classes no longer compete for the same lease while running with HA.

Written by the indexing model from the issue text.