Apply dependency management to gradle-protobuf-plugin classpath instead of implementation to prevent POM leak (#2601)

build.gradle.kts

@@ -345,6 +345,15 @@ subprojects {
                     }
                 }
             }
+
+            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")))
+                }
+            }
         }
 
         plugins.withId("ru.vyarus.animalsniffer") {

exporters/jaeger/build.gradle

@@ -28,10 +28,6 @@ dependencies {
 
     testImplementation project(':sdk:testing')
 
-    // Protobuf plugin seems to erroneously use the non-classpath configurations for resolving
-    // dependencies.
-    testImplementation enforcedPlatform(project(':dependencyManagement'))
-
     testRuntimeOnly "io.grpc:grpc-netty-shaded"
 }
 

proto/build.gradle

@@ -11,10 +11,6 @@ description = 'OpenTelemetry Proto'
 ext.moduleName = 'io.opentelemetry.proto'
 
 dependencies {
-    // Protobuf plugin seems to erroneously use the non-classpath configurations for resolving
-    // dependencies.
-    implementation enforcedPlatform(project(':dependencyManagement'))
-
     api "com.google.protobuf:protobuf-java",
             "io.grpc:grpc-api",
             "io.grpc:grpc-protobuf",