Remove setting BP_NATIVE_IMAGE

Closes gh-32884

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-nativeApp.gradle

@@ -28,13 +28,10 @@ bootJar {
 	manifest {
 		attributes(
 				'Implementation-Version': '1.0.0',
-				'Implementation-Title': "Paketo Test"
+				'Implementation-Title': 'Paketo Test',
+				// This shouldn't be necessary.
+				// See https://github.com/spring-projects/spring-boot/issues/42338
+				'Spring-Boot-Native-Processed': 'true'
 		)
 	}
 }
-
-bootBuildImage {
-	environment = ['BP_NATIVE_IMAGE': 'true',
-					//see https://github.com/paketo-buildpacks/native-image/issues/321
-				   'BP_NATIVE_IMAGE_BUILD_ARGUMENTS': '-H:-AddAllFileSystemProviders']
-}