[Helm] Fix issue with enabled flag handling when used as a subchart

[sm43]

What type of PR is this?

/kind bug

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

This PR fixes an issue where the enabled flag was not being correctly processed when the AWS EBS CSI Driver was used as a subchart.

Error during upgrade

Helm upgrade failed for release <> with chart <>: values don't meet the specifications of the schema(s) in the following chart(s): 
aws-ebs-csi-driver: - (root): Additional property enabled is not allowed Last Helm logs:

we reference the chart as

  - name: aws-ebs-csi-driver
    condition: aws-ebs-csi-driver.enabled
    repository: https://kubernetes-sigs.github.io/aws-ebs-csi-driver
    version: "~> 2.39.0"

For example:
Open Telemetry Helm chart handles it similar way
https://github.com/open-telemetry/opentelemetry-helm-charts/blob/a20fc37bb9cc96dbd146c2d5ab442982ae24a4c0/charts/opentelemetry-collector/values.schema.json#L19

How was this change tested?

Does this PR introduce a user-facing change?

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: sm43 / name: Shivam Mukhade (75805f3)

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @sm43. 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.

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[AndrewSirenko]

/ok-to-test

Hey @sm43, Thanks for the PR!

Can you can attach a gist with reproduction steps for how you tested aws-ebs-csi-driver as subchart before and after this PR to your PR description?

[k8s-ci-robot]

PR needs rebase.

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[sm43]

closing this as #2361 adds the change required. Thanks!