Remove AWS SDK bundling in branch linker.

[sobolk]

Related to: https://github.com/aws-amplify/samsara-cli/issues/554#issuecomment-1791513958 . And https://github.com/aws-amplify/samsara-cli/pull/562

We're adding workaround recommended here https://github.com/aws/aws-cdk/issues/26681#issuecomment-1705232051 .

When Lambda serves SDK 3.440.0+ we should remove local SDK bundling.

When we do this we should:

1. Remove bundling of AWS SDK in AmplifyBranchLinkerConstruct
2. Move @aws-sdk/client-amplify to devDependencies in @aws-amplify/backend