[Modules] Updated Azure Policy Definitions - mode to support 'Microsoft.Network.Data'

[ahmadabdalla]

Description

Added the new mode type Microsoft.Network.Data used for Azure Virtual Network Manager - Network Groups that use dynamic memberships.

See Policy Definitions Mode Type and Configuring Virtual Network Manager Network Groups using Azure Policy for more details.

Pipeline references

Pipeline

Type of Change

• New feature (non-breaking change which adds functionality)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code