fix: Parse --event-message-descriptor-set as binary protobuf (#1838)

Closes #1836

src/main/kotlin/org/wfanet/measurement/loadtest/dataprovider/SyntheticGeneratorEdpSimulatorRunner.kt

@@ -108,7 +108,7 @@ class SyntheticGeneratorEdpSimulatorRunner : EdpSimulatorRunner() {
     if (::eventMessageDescriptorSetFiles.isInitialized) {
       val fileDescriptorSets: List<DescriptorProtos.FileDescriptorSet> =
         eventMessageDescriptorSetFiles.map {
-          parseTextProto(it, DescriptorProtos.FileDescriptorSet.getDefaultInstance())
+          it.inputStream().use { input -> DescriptorProtos.FileDescriptorSet.parseFrom(input) }
         }
       builder.add(ProtoReflection.buildDescriptors(fileDescriptorSets))
     }