[cmd/telemetrygen] Remove remaining replace statement (open-telemetry#28565)

**Description:** open-telemetry#27878 was not enough to fix `go install`, this should
fix it.

**Link to tracking Issue:** Fixes open-telemetry#27855

Author: mx-psi

cmd/telemetrygen/go.mod

@@ -65,8 +65,5 @@ retract (
 	v0.65.0
 )
 
-// ambiguous import: found package cloud.google.com/go/compute/metadata in multiple modules
-replace cloud.google.com/go => cloud.google.com/go v0.110.2
-
-// IMPORTANT NOTE: Do not add local replace statements. This will break go install.
+// IMPORTANT NOTE: Do not add replace statements to this go.mod. This will break go install.
 // See https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/27855.