Include managementGroup().name as part of role assignment GUID to avoid possible duplicates.

[rjygraham]

Overview/Summary

This PR updates the parRoleAssignmentNameGuid default value is used to avoid potential duplicates:

Current:

@description('A GUID representing the role assignment name.  Default:  guid(parRoleDefinitionId, parAssigneeObjectId)')
param parRoleAssignmentNameGuid string = guid(parRoleDefinitionId, parAssigneeObjectId)

Updated:

@description('A GUID representing the role assignment name.  Default:  guid(managementGroup().name, parRoleDefinitionId, parAssigneeObjectId)')
param parRoleAssignmentNameGuid string = guid(managementGroup().name, parRoleDefinitionId, parAssigneeObjectId)

This PR fixes/adds/changes/removes

1. Possible duplicate roleAssignmentIds at Management Group scope when the parRoleAssignmentNameGuid default value is used.

Breaking Changes

1. Existing roleAssignmentIds at Management Group scope that utilized the default parRoleAssignmentNameGuid value.

Testing Evidence

As part of this Pull Request I have

• [x ] Checked for duplicate Pull Requests
• Associated it with relevant ADO items
• [x ] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x ] Performed testing and provided evidence.
• [x ] Updated relevant and associated documentation.

[jtracey93]

Thanks for raising this @rjygraham, good catch. As we already do this in the "..many" version of this module 👍

Could you also update the README.md in this module folder with the updated default value and description. As you did in the actual module itself👍

[rjygraham]

@jtracey93 just updated the README.md, apologies for missing it the first time.