IPv6-only support for S3 clients

[TheanLim]

Summary

Enables S3 and S3Manager clients to automatically use dualstack endpoints when running on IPv6-only instances.

Implementation details

1. Client Configuration Updates
   1. Modified NewS3ManagerClient and NewS3Client to accept IPCompatibility parameter
   2. Enhanced createAwsConfig to set useDualStackEndpoint based on IPv6 compatibility status
2. Task Resources
   1. S3 clients are mainly used by TaskResources such as EnvFiles, Firelens, and CredentialSpecs.
   2. Added an ipCompatibility field to each task resource.
      1. Updated New* constructors to accept an additional ipCompatibility parameter. New* is invoked when there's a new incoming task that requires task resources.
      2. Config.InstanceIPCompatibility is the source of value
3. Modified Task Resources interface to pass in *Config to Initialize(). Initialize() is invoked when Agent restarts and reinitialize task resouces
   1. Update all other task resources that implement this interface
4. CredentialsMetadataSetter Updates
   1. Updated NewCredentialsMetadataSetter to accept an IPCompatibility parameter
   2. Modified checkAndSetDomainlessGMSATaskExecutionRoleCredentialsImpl to use the IPCompatibility parameter when creating the CredentialSpecResource

Testing

Executed functional test suite on dualstack subnet. Verified all tests passed and dualstack endpoint usage through docker container logs.

Host: {bucket-name}-prod.s3.dualstack.us-west-2.amazonaws.com

Setups done:

• Set IPCompatibility to NewIPv6OnlyCompatibility
• Pin the functional test suite on a dualstack subnet (agent is currently connecting to control plane via IPv4).
• Set the awsConfig to Debug level and directed logs to os.Stdout.

New tests cover the changes: yes

• Refactored TestCreateAWSConfig to remove redundant test
• Extended the test to verify correct Dualstack flag configuration in Config

Description for the changelog

Enhancement: S3 and S3Manager clients resolves to dualstack endpoint on IPV6-only instances

Additional Information

Does this PR include breaking model changes? If so, Have you added transformation functions?

Does this PR include the addition of new environment variables in the README?

Licensing

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