Flaky test: ErrorFromXDSClientUpdate

[easwars]

--- FAIL: Test (3.19s)
    --- FAIL: Test/ErrorFromXDSClientUpdate (0.02s)
        tlogger.go:116: INFO clusterresolver.go:86 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Created  (t=+158.401µs)
        tlogger.go:116: INFO clusterresolver.go:163 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Received new balancer config: {
              "discoveryMechanisms": [
                {
                  "cluster": "test-cluster-name",
                  "edsServiceName": "test-eds-service-name",
                  "outlierDetection": {}
                }
              ]
            }  (t=+567.804µs)
        tlogger.go:116: INFO clusterresolver.go:221 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Built child policy config: {}  (t=+1.193609ms)
        tlogger.go:116: INFO clusterresolver.go:221 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Built child policy config: {}  (t=+1.559812ms)
        tlogger.go:116: WARNING clusterresolver.go:239 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Received error: connection error  (t=+1.656712ms)
        clusterresolver_test.go:313: <nil>
        tlogger.go:116: INFO clusterresolver.go:307 [xds] [xds-cluster-resolver-lb 0x40001e88c0] Shutdown  (t=+13.295699ms)
FAIL
FAIL	google.golang.org/grpc/xds/internal/balancer/clusterresolver	7.371s

https://github.com/grpc/grpc-go/actions/runs/4379111504/jobs/7664681135

[dfawley]

Maybe being removed in #6188

[easwars]

Yeah, this test no longer exists. There are some flakes in the clusterresolver tests, but those are down to https://github.com/grpc/grpc-go/issues/6408#issuecomment-1614982506.