Update status of annotation sidecar.istio.io/interceptionMode

[nmittler]

From https://github.com/istio/api/pull/1723/files#r516328646

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Expected behavior

Steps to reproduce the bug

Version (include the output of istioctl version --remote and kubectl version)

How was Istio installed?

Environment where bug was observed (cloud vendor, OS, etc)

[nmittler]

ping @costinm

[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2021-01-26. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

Created by the issue and PR lifecycle manager.