(CAT-1617) - Always load vendored module in PSModulePath

Prior to this commit, the vendored dsc module would only be loading into
the PSModulePath Env variable if the dsc resource type was implemented
as a Class.

Now that DSC Modules seem to be taking the approach of abstracting the
DscResource.Base module into a seperate module which is then imported,
we need to alter the PSModulePath Env variable to include the vendored
modules path to ensure these modules are imported as expected.

lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb

@@ -656,8 +656,8 @@ def interpolate_variables(string)
     modified_string
   end
 
-  # Parses a resource definition (as from `invocable_resource`) and, if the resource is implemented
-  # as a PowerShell class, ensures the System environment variable for PSModulePath is munged to
+  # Parses a resource definition (as from `invocable_resource`) and
+  # ensures the System environment variable for PSModulePath is munged to
   # include the vendored PowerShell modules. Due to a bug in PSDesiredStateConfiguration, class-based
   # DSC Resources cannot be called via Invoke-DscResource by path, only by module name, *and* the
   # module must be discoverable in the system-level PSModulePath. The postscript for invocation has
@@ -666,8 +666,6 @@ def interpolate_variables(string)
   # @param resource [Hash] a hash with the information needed to run `Invoke-DscResource`
   # @return [String] A multi-line string which sets the PSModulePath at the system level
   def munge_psmodulepath(resource)
-    return unless resource[:dscmeta_resource_implementation] == 'Class'
-
     vendor_path = resource[:vendored_modules_path].tr('/', '\\')
     <<~MUNGE_PSMODULEPATH.strip
       $UnmungedPSModulePath = [System.Environment]::GetEnvironmentVariable('PSModulePath','machine')