Added Support to Input Multiple User Assigned Identities

[Balashivaram]

Description

Azure Firewall team has made newer changes to feature Explicit Proxy. Explicit Proxy feature is already in Public Preview but the new changes will change the customer experience in using the Explicit Proxy feature. Due to this Explicit Proxy newer version is releasing again in Public preview and the new changes are added behind Feature Flag in all three places (Portal, Control Plane and Data Plane) and the new changes will be called by name Explicit Proxy V2. In Explicit Proxy V2 Version, removed HTTPs Port, instead of PAC File SAS URL customer needs to give PAC File URL with a managed identity which will have required roles to access the file

In the current PR to support Explicit Proxy V2 version, we have removed HTTPs Port Input, instead of PAC File SAS URL we will be getting PAC File URL as a input and a user Assigned Identity. Since Explicit Proxy is supported in Standard SKU, identity object has been removed from Premium property and customer can input multiple User Assigned Identities to support this User Assigned Identity parameter has been changes from String to Array of Strings

Mandatory Checklist

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[microsoft-github-policy-service]

Thank you for your contribution @Balashivaram! We will review the pull request and get back to you soon.

[wyunchi-ms]

Please update the src/Network/Network/ChangeLog.md and put your messages right under the Upcoming Release

[github-actions]

This PR was labeled "needs-revision" because it has unresolved review comments or CI failures.
Please resolve all open review comments and make sure all CI checks are green. Refer to our guide to troubleshoot common CI failures.

[msJinLei]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[msJinLei]

To remove the a parameter is a breaking change, which can only be release in the major release. The next one is in November.

@Balashivaram You can split the PR into breaking change commit and non-breaking change commit

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