[WIP] Separate go.mod for E2E tests

[ConnorJC3]

What type of PR is this?

/kind cleanup

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

WIP

How was this change tested?

WIP

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[github-actions]

Code Coverage Diff

File	Old Coverage	New Coverage	Delta
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/driver/node.go	92.2%	92.0%	-0.2
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/mounter/mount_linux.go	45.8%	41.2%	-4.6

[k8s-ci-robot]

@ConnorJC3: The following tests 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-verify	c7cbcd1	link	true	/test pull-aws-ebs-csi-driver-verify
pull-aws-ebs-csi-driver-test-e2e-external-eks-windows	c7cbcd1	link	true	/test pull-aws-ebs-csi-driver-test-e2e-external-eks-windows

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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