Use PSModule helper imports

Replace missing Helpers module imports with PSModule in publish and prerelease-cleanup actions.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/actions/Cleanup-PSModulePrereleases/src/cleanup.ps1

@@ -3,7 +3,7 @@ param()
 
 $PSStyle.OutputRendering = 'Ansi'
 
-Import-Module -Name 'Helpers' -Force
+Import-Module -Name 'PSModule' -Force
 
 #region Load inputs
 LogGroup 'Load inputs' {

.github/actions/Publish-PSModule/src/publish.ps1

@@ -27,7 +27,7 @@ param()
 
 $PSStyle.OutputRendering = 'Ansi'
 
-Import-Module -Name 'Helpers' -Force
+Import-Module -Name 'PSModule' -Force
 
 #region Load inputs
 LogGroup 'Load inputs' {