docs(helm): add podMutatorWebhookConfig to readme, update its description in values.yaml

[helpmehelpus]

Issue

No issue, just documentation. This is my first PR ever in this project, so I apologise in advance if I am skipping any part of the PR process and look forward for advice on how to comply.

Description

podMutatorWebhookConfig.failurePolicy was not included in README.md and its description in values.yaml mentioned pod mutation instead of service mutation.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: helpmehelpus
Once this PR has been reviewed and has the lgtm label, please assign wweiwei-li for approval. For more information see the Code Review Process.

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: helpmehelpus / name: Adriano Torres (2061ac9)

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[k8s-ci-robot]

Hi @helpmehelpus. Thanks for your PR.

I'm waiting for a github.com 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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/lifecycle stale

[k8s-ci-robot]

PR needs rebase.

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