Expand support for management group deployment

[Jefajers]

Overview/Summary

This PR expands current support for management group creation by accepting user creation of new folders and placement of management group templates in them (one new level is allowed per push).

Logic to validate template content and folder hierarchy matches current management group parent is performed before any deployment.

This PR fixes/adds/changes/removes

1. Changes AzOpsScope.ps1
2. Changes New-AzOpsDeployment.ps1
3. Changes Strings.psd1
4. Changes Repository.Tests.ps1
5. Adds microsoft.management_managementgroups-pushmgmttest1id.json
6. Adds microsoft.management_managementgroups-pushmgmttest2id.json

Breaking Changes

1. N/A

Testing Evidence

Three automated test cases are added.

1. Deployment of new management group using template and folder
2. Check existence of new management group
3. Deployment of new management group using template and folder at wrong scope and expect failure

As part of this Pull Request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated relevant and associated documentation.