chore: fix service.yaml internal flag name

Author: miraleung

rules_java_gapic/java_gapic.bzl

@@ -150,7 +150,7 @@ def java_gapic_library(
                 service_yaml_in_allowlist = True
                 break
         if service_yaml_in_allowlist:
-            file_args_dict[service_yaml] = "gapic-service-config"
+            file_args_dict[service_yaml] = "api-service-config"
         else:
             fail("Service.yaml is no longer supported in the Java microgenerator")
 

src/main/java/com/google/api/generator/gapic/protoparser/PluginArgumentParser.java

@@ -27,7 +27,7 @@ public class PluginArgumentParser {
   // Synced to rules_java_gapic/java_gapic.bzl.
   @VisibleForTesting static final String KEY_GRPC_SERVICE_CONFIG = "grpc-service-config";
   @VisibleForTesting static final String KEY_GAPIC_CONFIG = "gapic-config";
-  @VisibleForTesting static final String KEY_SERVICE_YAML_CONFIG = "gapic-service-config";
+  @VisibleForTesting static final String KEY_SERVICE_YAML_CONFIG = "api-service-config";
 
   private static final String JSON_FILE_ENDING = "grpc_service_config.json";
   private static final String GAPIC_YAML_FILE_ENDING = "gapic.yaml";