Migrate secretsmanager code to AWS SDK v2

[nrb]

Update calls in the following packages and files. Note that this is not necessarily an exhaustive list.

./pkg/cloud/services/secretsmanager/mock_secretsmanageriface
./pkg/cloud/services/secretsmanager/mock_secretsmanageriface/secretsmanagerapi_mock.go
./pkg/cloud/services/mock_services/secretsmanager_machine_interface_mock.go

[damdo]

See examples on how to migrate here: #5389

[richardcase]

/assign
/lifecycle active

[damdo]

Hey @richardcase are you still planning to work on this one?
Is one of the few remaining bits. TY

[richardcase]

Hey @richardcase are you still planning to work on this one? Is one of the few remaining bits. TY

Yes, i have been working on it. Should be complete on Friday.