Migrate ec2 code to AWS SDK v2

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

```
./test/mocks/aws_ec2api_mock.go
./pkg/cloud/scope/ec2.go
./pkg/cloud/filter/ec2.go
./pkg/cloud/services/mock_services/ec2_interface_mock.go
./pkg/cloud/services/gc/ec2.go
./pkg/cloud/services/instancestate/ec2events.go
./pkg/cloud/services/ec2
```