Migrate instancestate code to AWS SDK v2

[nrb]

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

./exp/instancestate/awsinstancestate_controller_test.go
./exp/instancestate/awsinstancestate_controller.go
./pkg/cloud/services/instancestate

[damdo]

See examples on how to migrate here: #5389

[phuhung273]

/assign