Replace New-TerminatingError with DscResource.Common error functions

[coderabbitai]

Description

The current implementation includes a custom New-TerminatingError function in the DhcpServerDsc.Common module. This should be replaced with the standardized error helper functions available in DscResource.Common.

Background

As per DSC Community guidelines, we should check DscResource.Common before creating private functions. The DscResource.Common module provides several error helper functions such as:

• New-InvalidDataException
• New-ArgumentException
• New-InvalidOperationException
• New-ObjectNotFoundException
• New-InvalidResultException
• New-NotImplementedException

Tasks

• Review usage of New-TerminatingError in DhcpServerDsc.Common
• Replace with appropriate DscResource.Common error functions
• Update unit tests accordingly
• Remove the custom New-TerminatingError function

References

• PR: Convert nested modules to buildable modules #96
• Comment: Convert nested modules to buildable modules #96 (comment)

Requested by: @dan-hughes