Fix CI: handle empty jar in NoSharedInternalCodeTest, add snakeyaml to testConvertToModel

- NoSharedInternalCodeTest: skip check when jar has no OpenTelemetry classes;
  autoconfigure-config is a dependency-only convenience module with no Java sources
- api/incubator testConvertToModel: add snakeyaml-engine to runtime deps;
  DeclarativeConfigurationParser (now in autoconfigure) uses snakeyaml internally
  but autoconfigure declares it compileOnly so it doesn't flow transitively
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

all/src/test/java/io/opentelemetry/all/NoSharedInternalCodeTest.java

@@ -69,6 +69,11 @@ void noSharedInternalCode(String artifactId, String absolutePath) throws IOExcep
               .filter(packageName -> packageName.startsWith(OTEL_BASE_PACKAGE))
               .collect(Collectors.toSet());
 
+      if (artifactOtelPackages.isEmpty()) {
+        logger.log(Level.INFO, artifactId + " has no OpenTelemetry classes, skipping check");
+        return;
+      }
+
       ClassesShouldConjunction noSharedInternalCodeRule =
           noClasses()
               .that()

api/incubator/build.gradle.kts

@@ -36,6 +36,7 @@ testing {
     register<JvmTestSuite>("testConvertToModel") {
       dependencies {
         implementation("com.fasterxml.jackson.core:jackson-databind")
+        implementation("org.snakeyaml:snakeyaml-engine")
         implementation(project(":sdk-extensions:incubator"))
         implementation(project(":sdk-extensions:autoconfigure"))
         implementation("com.google.guava:guava")