Use metadata as source of truth for latest version

[RedbackThomson]

Fixes aws-controllers-k8s/community#1361

Description of changes:
Code-generator currently compares the subdirectories in the API output directory (apis/) to determine the latest K8s version of the CRDs. The information about which API versions should be generated, and their status (available, deprecated, etc.), already exist in the metadata.yaml file. This pull request updates the source of truth for the code-generator to be the metadata.yaml file.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[vijtrip2]

/test s3-olm-test

[vijtrip2]

Neat!
/approve

[ack-bot]

@RedbackThomson: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
dynamodb-controller-test	220ed44	link	/test dynamodb-controller-test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[jaypipes]

All good, thank you @RedbackThomson

[jaypipes]

/lgtm

[ack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jaypipes, RedbackThomson, vijtrip2

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [RedbackThomson,jaypipes,vijtrip2]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment