clean up remaining code

Author: brendenehlers

sdk-extensions/autoconfigure/src/main/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdkBuilder.java

@@ -638,7 +638,6 @@ Thread shutdownHook(OpenTelemetrySdk sdk) {
             // https://github.com/open-telemetry/opentelemetry-java/issues/6827
             // logging deps might not be on the classpath at this point
             System.out.printf("%s Flush failed during shutdown: %s%n", Level.WARNING, e);
-            return;
           }
         });
   }

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/AutoConfiguredOpenTelemetrySdkTest.java

@@ -434,7 +434,6 @@ void builder_callAutoConfigureListeners() {
   }
 
   @Test
-  @SetSystemProperty(key = "maven.home", value = "temp")
   void builder_catchesException() throws InterruptedException {
     OpenTelemetrySdk sdk = mock(OpenTelemetrySdk.class);
     doThrow(NoClassDefFoundError.class).when(sdk).close();