Customize Intune policy assignments

[FabienTschanz]

Pull Request (PR) description

Adds a new parameter to the Update-DeviceConfigurationPolicyAssignment-Cmdlet to enable assignments for all Intune policies, despite different root key names.
Normally, the root key is assignments. In some cases, that name is changed to e.g. enrollmentConfigurationAssignments. The current implementation does not work with those different root key names. With the change, you can add the -RootIdentifier parameter with the root key name so that the POST and assign works for those resources as well.

This Pull Request (PR) fixes the following issues

None.

[ricmestre]

@NikCharlebois @andikrueger Hi, can this please be merged?

It'd still need a couple of fixes afterwards but the issue with assignments on IntuneDeviceEnrollmentPlatformRestriction that I reported on #4082 could be fixed with this in since the root identifier is hard coded right now to assignments but for this resource instead it needs to be enrollmentConfigurationAssignments as mentioned in https://learn.microsoft.com/en-us/graph/api/intune-shared-deviceenrollmentconfiguration-assign?view=graph-rest-beta

Edit: With that being said if this gets merged please don't close my issue #4082 since out of the box as I mentioned will still need some fixes.

[FabienTschanz]

@NikCharlebois @andikrueger Can you have a look and merge it please? There is the pull request #4362 waiting that has this one as a requirement. And it's already open for a quite a long time too.

[ykuijs]

LGTM