Fix armeria-grpc latest dep test (open-telemetry#12734)

Author: laurit

instrumentation/armeria/armeria-grpc-1.14/javaagent/build.gradle.kts

@@ -1,5 +1,8 @@
+import com.google.protobuf.gradle.*
+
 plugins {
   id("otel.javaagent-instrumentation")
+  id("com.google.protobuf")
 }
 
 muzzle {
@@ -18,6 +21,35 @@ dependencies {
   testInstrumentation(project(":instrumentation:netty:netty-4.1:javaagent"))
   testInstrumentation(project(":instrumentation:grpc-1.6:javaagent"))
 
-  testImplementation(project(":instrumentation:grpc-1.6:testing"))
   testLibrary("com.linecorp.armeria:armeria-junit5:1.14.0")
 }
+
+val latestDepTest = findProperty("testLatestDeps") as Boolean
+protobuf {
+  protoc {
+    val protocVersion = if (latestDepTest) "4.28.2" else "3.19.2"
+    artifact = "com.google.protobuf:protoc:$protocVersion"
+  }
+  plugins {
+    id("grpc") {
+      val grpcVersion = if (latestDepTest) "1.43.2" else "1.68.1"
+      artifact = "io.grpc:protoc-gen-grpc-java:$grpcVersion"
+    }
+  }
+  generateProtoTasks {
+    all().configureEach {
+      plugins {
+        id("grpc")
+      }
+    }
+  }
+}
+
+afterEvaluate {
+  // Classpath when compiling protos, we add dependency management directly
+  // since it doesn't follow Gradle conventions of naming / properties.
+  dependencies {
+    add("compileProtoPath", platform(project(":dependencyManagement")))
+    add("testCompileProtoPath", platform(project(":dependencyManagement")))
+  }
+}

instrumentation/armeria/armeria-grpc-1.14/javaagent/src/test/proto/helloworld.proto

@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package example;
+
+service Greeter {
+  rpc SayHello (Request) returns (Response) {
+  }
+
+  rpc SayMultipleHello (Request) returns (stream Response) {
+  }
+
+  rpc Conversation (stream Response) returns (stream Response) {
+  }
+}
+
+message Request {
+  string name = 1;
+}
+
+message Response {
+  string message = 1;
+}