Merge branch 'update-istio-controlplane-tag-1.18.2-bb.0' into 'master'

istio & operator update to 1.18.2-bb.0

Closes big-bang/product/packages/istio-controlplane#107 and big-bang/product/packages/istio-operator#52

See merge request !2972

(cherry picked from commit 7fb0be51)

5c9f788e Updated istio git tag
9b64f248 Update istioOperator tag in values.yaml