opentelemetry-collector-contrib: disable check

As discussed in
https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/31678,
the tests inside cmd/otelcontrib can't be run any more.

pkgs/tools/misc/opentelemetry-collector/contrib.nix

@@ -39,14 +39,7 @@ buildGoModule rec {
   # it instead of trusting the global $PATH.
   propagatedBuildInputs = lib.optionals withSystemd [ systemdMinimal ];
 
-  preCheck = "export CGO_ENABLED=1";
-
-  checkFlags = [
-    # collectd test tries and fails to bind to port 8081
-    # mezo test tries to reach external service
-    # memory_ballast test fails on darwin for mysterious reasons.
-    "-skip=TestDefaultReceivers/collectd|TestDefaultExporters/mezmo${lib.optionalString stdenv.isDarwin "|TestDefaultExtensions/memory_ballast"}"
-  ];
+  doCheck = false;
 
   ldflags = [
     "-s"