Backport of Exclude openebs namespace from injection. into release/0.49.x

[thisisnotashwin]

Backport

This PR is auto-generated from #1869 to be assessed for backporting due to the inclusion of the label backport/0.49.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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The below text is copied from the body of the original PR.

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OpenEBS is a Kubernetes storage solution. When you spin up a PVC, under the hood OpenEBS creates a pod to handle the necessary storage operations. If the openebs namespace is not excluded from injection, that pod can't start because our mutatingwebhook config requires all pod scheduling requests make it to our webhook and our webhook isn't running yet because the consul servers aren't running.

This is a breaking change but I think it's worth it because it's very unlikely anyone is using the openebs namespace for anything other than openebs.

Fixes #1867

Checklist:

• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)

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Overview of commits

• 43f6a79 - 57f5205