fix(policy): remove duplicate WAF-on-AppGw built in Enforce-Guardrails-Network_20250326

[pratyushverma63]

Summary

The Enforce-Guardrails-Network_20250326 initiative referenced the built-in policy
564feb30-bf6a-4854-b4bb-0d2d2d1e6c66 ("Web Application Firewall (WAF) should be enabled for
Application Gateway") twice:

| Deny-Waf-Fw-rules | wafFwRules |
| Deny-AppGw-Without-Waf (duplicate) | appGwWaf |

The Deny-AppGw-Without-Waf entry is redundant — the same built-in is already enforced via
Deny-Waf-Fw-rules. This PR removes the duplicate reference and its now-unused appGwWaf parameter.

Removing a parameter (appGwWaf) from a published initiative can adversely impact any existing
assignment that sets it. Per the breaking-change process,
the fix is delivered as a new dated initiative rather than an in-place edit.

Changes

• Deprecated Enforce-Guardrails-Network_20250326 — kept as-published, with
  [Deprecated]: displayName, version: 2.0.0-deprecated, deprecated: true, and
  supersededBy: Enforce-Guardrails-Network_20260714.
• Added Enforce-Guardrails-Network_20260714 — identical content removed the duplicate
  reference and appGwWaf parameter; replacesPolicy: Enforce-Guardrails-Network_20250326;
  version: 2.1.0.
• initiatives.bicep — loads both the deprecated and the new initiative.
• initiatives.json — regenerated from Bicep.
• ENFORCE-GuardrailsNetworkPolicyAssignment.json — default assignment repointed to
  _20260714. (The default assignment does not set appGwWaf, so no assignment parameters change.)
• eslz-portal.json — AzAdvertizer tooltip URL updated to _20260714.

Files changed (6)

• src/resources/Microsoft.Authorization/policySetDefinitions/Enforce-Guardrails-Network_20250326.json
• src/resources/Microsoft.Authorization/policySetDefinitions/Enforce-Guardrails-Network_20260714.json (new)
• src/templates/initiatives.bicep
• eslzArm/managementGroupTemplates/policyDefinitions/initiatives.json
• eslzArm/managementGroupTemplates/policyAssignments/ENFORCE-GuardrailsNetworkPolicyAssignment.json
• eslzArm/eslz-portal.json

Testing

tested that policy is shown in the portal https://portal.azure.com/#view/Microsoft_Azure_Policy/PolicyDetail.ReactView/id/%2Fproviders%2Fmicrosoft.authorization%2Fpolicydefinitions%2F564feb30-bf6a-4854-b4bb-0d2d2d1e6c66/version/2.0.0/scopes~/%5B%22%2Fsubscriptions%2F1a32a88c-076d-45a5-87c7-978346609b5a%22%5D

Related docs PR

Deprecation notice added in Azure/Azure-Landing-Zones: Azure/Azure-Landing-Zones#4211

BREAKING CHANGE: Enforce-Guardrails-Network_20250326 is deprecated and replaced by
Enforce-Guardrails-Network_20260714 (removes the appGwWaf parameter).

[Copilot]

Pull request overview

This PR updates the Enforce-Guardrails-Network_20250326 custom policy initiative by removing a duplicate reference to the built-in “WAF should be enabled for Application Gateway” policy and deleting the now-unused appGwWaf initiative parameter, keeping the remaining WAF-on-AppGw enforcement via the existing Deny-Waf-Fw-rules reference.

Changes:

• Removed the appGwWaf initiative parameter (previously only used by the duplicate reference).
• Removed the duplicate policy reference block Deny-AppGw-Without-Waf for built-in policy 564feb30-bf6a-4854-b4bb-0d2d2d1e6c66.

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