cluster-autoscaler: consume aws-sdk-go-v2

[domenicbozzuto]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The follow-up to #8265, this PR is part of the effort to transition to the new version of AWS's sdk for go (see #7093). This is PR 2/3, where the newly-vendored aws-sdk-go-v2 and smithy-go packages are consumed in the aws cloud provider.

The following are some of the larger changes that come with the new sdk:

• Each service now has a separate package for data types (e.g. .../service/ec2/types) and for API interfaces (.../service/ec2)
• Structs contain more values and less references (e.g. []string vs []*string)
• Pagination is handled slightly differently
• Clients are instantiated differently (no longer use aws.session)
• Endpoint resolves are per-service instead of global

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: domenicbozzuto
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[k8s-ci-robot]

PR needs rebase.

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[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle rotten

[domenicbozzuto]

We opted to use the v2 sdk directly instead of vendoring in #8896; closing this out