TestLabelsDemoApp: marshaling tetragon.GetEventsResponse: size mismatch

[kkourt]

From #2815

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- All services are available via the Frontend proxy: http://localhost:8080
  by running these commands:
     kubectl --namespace labels port-forward svc/otel-demo-frontendproxy 8080:8080

  The following services are available at these paths once the proxy is exposed:
  Webstore             http://localhost:8080/
  Grafana              http://localhost:8080/grafana/
  Load Generator UI    http://localhost:8080/loadgen/
  Jaeger UI            http://localhost:8080/jaeger/ui/
--- FAIL: TestLabelsDemoApp (118.64s)
    --- FAIL: TestLabelsDemoApp/Run_Event_Checks (80.14s)
        --- FAIL: TestLabelsDemoApp/Run_Event_Checks/Run_Event_Checks (80.14s)
            rpcchecker.go:171: 
                	Error Trace:	/home/runner/actions-runner/_work/tetragon/tetragon/go/src/github.com/cilium/tetragon/tests/e2e/checker/rpcchecker.go:171
                	            				/home/runner/actions-runner/_work/tetragon/tetragon/go/src/github.com/cilium/tetragon/vendor/sigs.k8s.io/e2e-framework/pkg/env/env.go:422
                	            				/home/runner/actions-runner/_work/tetragon/tetragon/go/src/github.com/cilium/tetragon/vendor/sigs.k8s.io/e2e-framework/pkg/env/env.go:453
                	Error:      	Received unexpected error:
                	            	event checker labelsEventChecker failed to receive event: rpc error: code = Internal desc = grpc: error while marshaling: marshaling tetragon.GetEventsResponse: size mismatch (see https://github.com/golang/protobuf/issues/1609): calculated=321, measured=829
                	Test:       	TestLabelsDemoApp/Run_Event_Checks/Run_Event_Checks
                	Messages:   	checks should pass
FAIL
coverage: [no statements]
I0904 06:41:34.330191   17923 dumpinfo.go:48] "Dumping test data" dir="/tmp/tetragon.e2e.TestLabelsDemoApp.1245090608"

Based on the discussion in golang/protobuf#1609, it seems that the error might be coming from changes in the object sent in the gRPC.