In OSSM 3.x we need to make sure all our namespaces are labeled with `istio-injection=enabled` ourselves (OSSM 2.x did not need that).

See more details on: https://redhat-internal.slack.com/archives/C019EPZ233P/p1727684613070569?thread_ts=1727347316.725149&cid=C019EPZ233P and https://github.com/ReToCode/oss-ossm-3-integration/blob/main/INJECTION.md and the docs: https://istio.io/latest/docs/setup/additional-setup/sidecar-injection/#controlling-the-injection-policy