feat(terraform): Ensure App Service Environment is zone redundant

[tdefise]

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Description

Fixes #5661

Description

Applications deployed on a zonal ILB (Internally Load Balanced) ASE (App Service Environment) will continue to run and serve traffic on that ASE even if other zones in the same region suffer an outage. It is possible that non-runtime behaviors, including; application service plan scaling, application creation, application configuration, and application publishing may still be impacted from an outage in other availability zones.
Source : https://learn.microsoft.com/en-us/azure/app-service/environment/zone-redundancy

Fix

Enable Zone Redundancy

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[gruebel]

🍻