[bitnami/external-dns] Add VirtualService support for istio

[thomasv314]

Description of the change

Adds the ability for external DNS to pull information about Istio VirtualServices

Benefits

Supports functionality existing in the latest version of external-dns

Possible drawbacks

None

Applicable issues

None

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver.
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [bitnami/chart])
• If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files

⚠️ Keep in mind that if you want to make changes to the kubeapps chart, please implement them in the kubeapps repository. This is only a synchronized mirror.

[javsalgar]

Thank you for the PR! LGTM

[javsalgar]

Before merging, could you check that updating the cluster role does not break upgrades? I know that there are some immutable fields in some of the K8s objects. Could you confirm that this is not the case?

[thomasv314]

hi @javsalgar, appreciate the quick review. I can confirm that the fields modified in this PR are mutable and does not break upgrades.

[javsalgar]

Awesome, merging then. Thanks!