Replace powershell generator with powershell-experimental generator (#6213)

* replace powershell generator with powershell-experimental generator

* add back samples

* add back scripts

* remove outdated script

* update doc

samples/client/petstore/powershell/tests/Model/InlineObject.Tests.ps1

@@ -0,0 +1,17 @@
+#
+# OpenAPI Petstore
+# This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+# Version: 1.0.0
+# Generated by OpenAPI Generator: https://openapi-generator.tech
+#
+
+Describe -tag 'PSPetstore' -name 'InlineObject' {
+    Context 'InlineObject' {
+        It 'New-InlineObject' {
+            # a simple test to create an object
+            #$NewObject = New-InlineObject -Name "TEST_VALUE" -Status "TEST_VALUE"
+            #$NewObject | Should BeOfType InlineObject
+            #$NewObject.property | Should Be 0
+        }
+    }
+}