[master] Release notes for Istio 1.14.6 (#12360)

* Release notes for Istio 1.14.6

* Fix lint

Co-authored-by: Lei Tang <32078630+lei-tang@users.noreply.github.com>

content/en/news/releases/1.14.x/announcing-1.14.6/index.md

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+---
+title: Announcing Istio 1.14.6
+linktitle: 1.14.6
+subtitle: Patch Release
+description: Istio 1.14.6 patch release.
+publishdate: 2022-12-12
+release: 1.14.6
+---
+
+This release contains bug fixes to improve robustness. This release note describes what is different between Istio 1.14.5 and Istio 1.14.6.
+
+FYI, this release includes security fixes in Go 1.18.9 (released on 2022-12-06).
+
+{{< relnote >}}
+
+## Changes
+
+- **Fixed** an issue when deleting a custom gateway using an Istio Operator custom resource, other gateways are restarted.
+  ([Issue #40577](https://github.com/istio/istio/issues/40577))
+
+- **Fixed** an issue with missing `service_name` in Telemetry API when configuring Datadog tracing provider.
+  ([Issue #38573](https://github.com/istio/istio/issues/38573))
+
+- **Fixed** an issue where a wrong schema configuration caused the Istio Operator to go into an error loop.
+  ([Issue #40876](https://github.com/istio/istio/issues/40876))
+
+- **Fixed** an issue where gateway pods did not respect the `global.imagePullPolicy` specified in the Helm values.
+
+- **Added** warning validation messages when a DestinationRule specifies failover policies but does not provide an `OutlierDetection` policy.
+  Previously, istiod silently ignored the failover settings.
+
+- **Improved** when Wasm module downloading fails and `fail_open` is true, a RBAC filter allows all traffic to pass to `Envoy` instead of the original Wasm filter.
+  Previously, the given Wasm filter itself was passed to `Envoy` in this case, but it may cause errors because some fields of Wasm configuration are optional in Istio, but not in `Envoy`.