[helm chart] Use recommended labels and label helpers

[naseemkullah]

What this PR does / why we need it:

Use recommended labels in preparation for new helm chart.
Also use include function over template where applicable.

Part of #5161

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

How Has This Been Tested?

Not tested, please review carefully.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

Hi @naseemkullah. Thanks for your PR.

I'm waiting for a kubernetes 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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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.

[aledbf]

/ok-to-test

[aledbf]

/approve

[aledbf]

cc @ChiefAlexander

[ChiefAlexander]

A few other spots look like they need updating:
https://github.com/kubernetes/ingress-nginx/pull/5185/files#diff-161e27e4dad3d26202569098ce0ec2b7R5
https://github.com/kubernetes/ingress-nginx/pull/5185/files#diff-e915735ed7b67ecdde92336342ab87caR24
https://github.com/kubernetes/ingress-nginx/pull/5185/files#diff-44dedea5f6edfcfcd4d0660143043785R24

[ChiefAlexander]

Better links to the files:
https://github.com/naseemkullah/ingress-nginx/blob/chart-labels/charts/ingress-nginx/templates/admission-webhooks/validating-webhook.yaml#L5-L10
https://github.com/naseemkullah/ingress-nginx/blob/chart-labels/charts/ingress-nginx/templates/admission-webhooks/job-patch/job-createSecret.yaml#L24-L29
https://github.com/naseemkullah/ingress-nginx/blob/chart-labels/charts/ingress-nginx/templates/admission-webhooks/job-patch/job-patchWebhook.yaml#L24-L29

[naseemkullah]

Thanks @ChiefAlexander, changes applied.

[ChiefAlexander]

lgtm

[aledbf]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, naseemkullah

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• OWNERS [aledbf]

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