Migrate ECS client to aws-sdk-go-v2

[tinnywang]

Summary

Migrate ECS client to aws-sdk-go-v2.

#4406 added our bespoke codegen'd aws-sdk-go-v2 ECS client. This PR integrates the v2 ECS client with Agent and removes all uses of our v1 ECS client.

Implementation details

In go.mod for the agent and ecs-agent modules,

1. add a dependency ongithub.com/aws/aws-sdk-go-v2/service/ecs
2. add a replace directive so that we use our bespoke ECS package instead of the official SDK package

replace github.com/aws/aws-sdk-go-v2/service/ecs => ../aws-sdk-go-v2/service/ecs

Update ECS client construction per the docs.

Replace all uses of our v1 ECS client with the v2 ECS client.

• Package aws/aws-sdk-go/service/ecs is now split between aws/aws-sdk-go-v2/service/ecs and aws/aws-sdk-go-v2/service/ecs/types.
• Many pointer types are now non-pointers (e.g. ContainerStateChange.NetworkBindings changed from []*NetworkBinding to []NetworkBinding). See the docs for more info.
• Many int64 types are now int32 (e.g. NetworkBinding.ContainerPort and NetworkBinding.HostPort changed from *int64 to *int32).
• Many string constants now have their own enum types aliased to string (e.g. the AgentUpdateStatus* constants changed from string to type AgentUpdateStatus.
• ErrCode*Exception string constants have been replaced with Exception types (e.g. ErrCodeAccessDeniedException ("AccessDeniedException") now corresponds to the AccessDeniedException type).

Update error handling to handle SDKv1 and SDKv2 errors. v1 error handling can be removed after all clients have been migrated to aws-sdk-go-v2. See the docs for more info on error handling in v2.

• aws.Error is analogous to smithy.APIError.
• Service-specific errors that were identifiable via string error codes now have modeled error types (compare this v1 example with this v2 example).
• aws.RequestFailure, which includes the request ID, is analogous to http.ResponseError (see the docs for more info).

Rewrite the oneDayRetrier to be compatible with aws-sdk-go-v2 per the docs.

Testing

GitHub checks pass.

New tests cover the changes: no

Description for the changelog

Migrate ECS client toaws-sdk-go-v2.

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.