tests/resource/aws_ecs_service: Fix TestAccAWSEcsService_withLaunchTypeFargate for parallelization and configuration updates
tests/resource/aws_ecs_service: Fix TestAccAWSEcsService_withLaunchTypeFargate for parallelization and configuration updates

Previously, it this acceptance test was not parallelized with the other tests and was creating/destroying the AWS resources between each "step". This now tests via updates, which verifies that functionality and runs much faster (~300s -> ~100s).

Output from acceptance testing:

```
--- PASS: TestAccAWSEcsService_basicImport (31.52s)
--- PASS: TestAccAWSEcsService_disappears (20.52s)
--- PASS: TestAccAWSEcsService_healthCheckGracePeriodSeconds (249.26s)
--- PASS: TestAccAWSEcsService_ManagedTags (40.42s)
--- PASS: TestAccAWSEcsService_PropagateTags (76.33s)
--- PASS: TestAccAWSEcsService_Tags (39.68s)
--- PASS: TestAccAWSEcsService_withAlb (250.49s)
--- PASS: TestAccAWSEcsService_withARN (37.60s)
--- PASS: TestAccAWSEcsService_withDaemonSchedulingStrategy (49.10s)
--- PASS: TestAccAWSEcsService_withDaemonSchedulingStrategySetDeploymentMinimum (16.55s)
--- PASS: TestAccAWSEcsService_withDeploymentController_Type_CodeDeploy (355.17s)
--- PASS: TestAccAWSEcsService_withDeploymentMinimumZeroMaximumOneHundred (40.75s)
--- PASS: TestAccAWSEcsService_withDeploymentValues (30.13s)
--- PASS: TestAccAWSEcsService_withEcsClusterName (39.48s)
--- PASS: TestAccAWSEcsService_withFamilyAndRevision (35.50s)
--- PASS: TestAccAWSEcsService_withIamRole (177.26s)
--- PASS: TestAccAWSEcsService_withLaunchTypeEC2AndNetworkConfiguration (56.07s)
--- PASS: TestAccAWSEcsService_withLaunchTypeFargate (112.72s)
--- PASS: TestAccAWSEcsService_withLbChanges (277.71s)
--- PASS: TestAccAWSEcsService_withPlacementConstraints (24.62s)
--- PASS: TestAccAWSEcsService_withPlacementConstraints_emptyExpression (30.15s)
--- PASS: TestAccAWSEcsService_withPlacementStrategy (119.51s)
--- PASS: TestAccAWSEcsService_withRenamedCluster (52.67s)
--- PASS: TestAccAWSEcsService_withReplicaSchedulingStrategy (28.76s)
--- PASS: TestAccAWSEcsService_withServiceRegistries (211.01s)
--- PASS: TestAccAWSEcsService_withServiceRegistries_container (201.62s)
--- PASS: TestAccAWSEcsService_withUnnormalizedPlacementStrategy (40.50s)
```

terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws