[QE] Default SUT for upgrade tests shouldn't wait to be ready, but rely on WaitForAllTestResourcesReadyOrFail

[cardil]

Currently, there is a code that waits for triggers to report ready:

eventing/test/upgrade/prober/sut/broker.go

Lines 136 to 139 in 674815e

	err := duck.WaitForResourceReady(ctx.Client.Dynamic, meta)
	if err != nil {
	ctx.T.Fatal(err)
	}

And that code is invoked before those trigger's subscribers are even deployed:

eventing/test/upgrade/prober/prober.go

Lines 192 to 196 in 674815e

	p.deployConfiguration()
	p.deployReceiver()
	if p.config.Serving.Use {
	p.deployForwarder()
	}

We should check for readiness state, once, only at:

eventing/test/upgrade/prober/prober.go

Line 197 in 674815e

p.client.WaitForAllTestResourcesReadyOrFail(p.config.Ctx)

[cardil]

/assign

[cardil]

/area test-and-release