blog: Add Zero Trust network policies article reference

[p-rog]

Adds a blog post linking to the Red Hat Developer blog article on Zero Trust network policies in the Layered Zero Trust Validated Pattern.

The post introduces the default-deny + per-pod allow pattern implemented across Vault, Keycloak, ZTWIM, and qtodo namespaces, and directs readers to the full article for technical details.

Red Hat Developer blog: https://developers.redhat.com/articles/2026/06/26/cant-patch-fast-enough-zero-trust-last-line-defense

The blog url us not active yet and may change!

[openshift-ci]

Hi @p-rog. Thanks for your PR.

I'm waiting for a validatedpatterns member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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