Migrate integration test AWS CloudFormation/AutoScaling from SDK v1 to v2

[pjfanning]

The aws-api-ec2 integration test used legacy com.amazonaws (SDK v1) for CloudFormation and AutoScaling, while the rest of the project already adopts software.amazon.awssdk (SDK v2).

Changes

• project/Dependencies.scala: Extracted awsSdkV2Version = "2.42.19" constant; updated existing ecs v2 dependency to reference it
• integration-test/aws-api-ec2/build.sbt: Replaced com.amazonaws:aws-java-sdk-cloudformation and com.amazonaws:aws-java-sdk-autoscaling with their software.amazon.awssdk equivalents (with apache-client excluded, consistent with the ECS dependency)
• IntegrationTest.scala: Migrated CloudFormation API from v1 mutable-builder style to v2 immutable-builder pattern; updated response types and accessors

Before:

private val awsCfClient = AmazonCloudFormationClientBuilder.standard().withRegion(region).build()

val createStackRequest = new CreateStackRequest()
  .withCapabilities("CAPABILITY_IAM")
  .withStackName(stackName)
  .withParameters(new Parameter().withParameterKey("Build").withParameterValue(...))

var dsr: DescribeStacksResult = null
stack.getStackStatus == StackStatus.CREATE_COMPLETE.toString
stack.getOutputs.asScala.exists(_.getOutputKey == "AutoScalingGroupName")

After:

private val awsCfClient = CloudFormationClient.builder().region(Region.of(region)).build()

val createStackRequest = CreateStackRequest.builder()
  .capabilities(Capability.CAPABILITY_IAM)
  .stackName(stackName)
  .parameters(Parameter.builder().parameterKey("Build").parameterValue(...).build())
  .build()

var dsr: DescribeStacksResponse = null
stack.stackStatus() == StackStatus.CREATE_COMPLETE
stack.outputs().asScala.exists(_.outputKey() == "AutoScalingGroupName")