[Backport] Gateway API: Support backend TLS for KAS/Registry/Workhorse

Clemens Beckrequested to merge
cb-backport-gwapi-backendtls into 9-11-stable

What does this MR do?

This backports !4918 (merged) to GitLab chart 9.11.

⚠️ This is a typefeature about to be backported on request of Dedicated to assist rolling out Envoy for PubSec customers.

Related issues

Relates Envoy Gateway - internal TLS support (#6363 - closed) • Clemens Beck • 19.0

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