Fix AWSManagedControlPlane controller to use TagUnmanagedNetworkResources feature gate

[cnmcavoy]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fix AWSManagedControlPlane controller to use TagUnmanagedNetworkResources feature gate.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #4439

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

Fix AWSManagedControlPlane controller to use TagUnmanagedNetworkResources feature gate.

[k8s-ci-robot]

Hi @cnmcavoy. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Skarlso]

/ok-to-test

[Skarlso]

/lgtm

[Skarlso]

/test ?

[k8s-ci-robot]

@Skarlso: The following commands are available to trigger required jobs:

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/test ?

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[Skarlso]

/test pull-cluster-api-provider-aws-e2e-eks

[Ankitasw]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ankitasw

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[Ankitasw]

/retest