Remove vendored aws-sdk-go package

[domenicbozzuto]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR is a direct followup to #8896; 8896 upgraded the version of the aws-sdk-go used to the new aws-sdk-go-v2. This finishes the removal by deleting the vendored v1 of the sdk, and removes the special handling of that directory from various bits of the hack/ scripts.

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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[domenicbozzuto]

CC'ing Jack per today's sig-autoscaling discussion, this should be the last of the v1 sdk

/cc @jackfrancis

[jackfrancis]

/ok-to-test

[jackfrancis]

/test pull-cluster-autoscaler-e2e-azure-master

[jackfrancis]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: domenicbozzuto, jackfrancis

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Needs approval from an approver in each of these files:

• cluster-autoscaler/cloudprovider/aws/OWNERS [jackfrancis]
• hack/OWNERS [jackfrancis]

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