feat(arm): add FunctionAppsEnableAuthentication

[SaraWeinberg1234]

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Description

adds a FunctionAppsEnableAuthentication

Description

I added a test that checks whether a value with a value of true is found under a certain field

Fix

How does someone fix the issue in code and/or in runtime?

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