Adjust error codes

[ElijahQuinones]

What type of PR is this?

/kind cleanup

What is this PR about? / Why do we need it?

This PR is to address what error codes we return on createVolume failures when we are unsure if a volume could have been created already.

How was this change tested?

TODO WIP

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

@ElijahQuinones: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-aws-ebs-csi-driver-unit	0264fe5	link	true	/test pull-aws-ebs-csi-driver-unit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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