feat(resourcegroup): add tag feature for networkwatcherrg

[wetwicky]

Overview/summary

Allow configuring tags on networkWatcher resource group by using an optional variable which default to an empty map. fixes

• feat: allow to configure networkWatcher RG tags #420

This feature is practical for scenario where tags are inherited from subscription using azure policies

Testing evidence

without this modification, terraform would always detect drift (if azure policies modify the tags).

allowing to set tag on networkWatcher resource group using an input variable

As part of this pull request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Run and make fmt & make docs to format your code and update documentation.
• Created unit and deployment tests and provided evidence.
• Updated relevant and associated documentation.