Remove v1alpha4 from CRDs

[lzichong]

Description

Please provide a brief description of the changes proposed in this Pull Request

• Remove v1alpha4 labels and regenerated CRDs with make manifests

Checklist

• tested locally
• updated any relevant dependencies
• updated any relevant documentation or examples

API Changes

Are there API changes?

• Yes
• No

If yes, please fill in the below

1. Updated conversions?
   • Yes
   • No
   • N/A
2. Updated CRDs?
   • Yes
   • No
   • N/A
3. Updated infrastructure-components.yaml?
   • Yes
   • No
   • N/A
4. Updated ./examples/capi-quickstart.yaml?
   • Yes
   • No
   • N/A
5. Updated necessary files under ./infrastructure-vcd/v1.0.0/?
   • Yes
   • No
   • N/A

Issue

If applicable, please reference the relevant issue

Fixes #

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This change is 

[sahithi]

missing the final infrastruture-components.yaml?

[arunmk]

There is an entry in PROJECT as well. However, the recommendation is to not edit that file directly. It is harmless for now and we can leave it. It may need to be changed when we add a new API version which is unlikely at this point.

Hence, LGTM.

[sahithi]

Please update https://github.com/vmware/cluster-api-provider-cloud-director/blob/1.3.z/docs/CLUSTERCTL.md with the latest corecapi version.

LGTM