Update Istio to 1.15.0

Package Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/blob/1.15.0-bb.0/CHANGELOG.md

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator/-/blob/1.15.0-bb.0/CHANGELOG.md

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/125

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator/-/merge_requests/58

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/issues/80

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator/-/issues/35

chart/values.yaml

@@ -128,7 +128,7 @@ istio:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane.git
     path: "./chart"
-    tag: "1.14.3-bb.4"
+    tag: "1.15.0-bb.0"
 
   # -- Tetrate Istio Distribution - Tetrate provides FIPs verified Istio and Envoy software and support,
   # validated through the FIPs Boring Crypto module. Find out more from Tetrate - https://www.tetrate.io/tetrate-istio-subscription
@@ -244,7 +244,7 @@ istiooperator:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator.git
     path: "./chart"
-    tag: "1.14.3-bb.0"
+    tag: "1.15.0-bb.0"
 
   # -- Flux reconciliation overrides specifically for the Istio Operator Package
   flux: {}