Enhance entra m365group user set by specifying multiple users

[milanholemans]

Currently, the command entra m365group user set only supports specifying one user by UPN. Let's enhance this command so it can accept multiple users by UPN or ID.
In addition, let's also add the possibility to reference the group by display name.

Options to add

Option	Description
--groupName [groupName]	The display name of the Microsoft 365 group. Specify only one of the following: groupId, groupName, teamId, or teamName.
--teamName [teamName]	The display name of the Microsoft Teams team. Specify only one of the following: groupId, groupName, teamId, or teamName.
--ids [ids]	Microsoft Entra IDs of users. You can also pass a comma-separated list of IDs. Specify either ids or userNames but not both.
--userNames [userNames]	The user principal names of users. You can also pass a comma-separated list of UPNs. Specify either ids or userNames but not both.

Deprecate current option

This will come at a cost, we'll have to deprecate the currently required option -n, --userName <userName>.
Let's make the option optional and deprecate it.

• Create v8 issue to remove the deprecated option.

[Saurabh7019]

@milanholemans, Can you assign this one to me as well? It's quite similar to #6060