feat(arm): add CKV_AZURE_73 to ensure that Automation account variables are encrypted

[userrut]

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Description

This change introduces the CKV_AZURE_73 validation to verify encryption of all variables within the Azure Automation account. By implementing this check, we guarantee the protection and encryption of sensitive information stored in these variables.

Fixes # (issue)

New/Edited policies (Delete if not relevant)

Description

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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

[ChanochShayner]

💯