all tests are now marked with proper tag

also, update build.psm1 to be more flexible

test/powershell/Host/Base-Directory.Tests.ps1

@@ -1,4 +1,4 @@
-Describe "Configuration file locations" -tags "CI" {
+Describe "Configuration file locations" -tags "CI","Slow" {
 
     BeforeAll {
         $powershell = Join-Path -Path $PsHome -ChildPath "powershell"

test/powershell/Host/Read-Host.Tests.ps1

@@ -1,4 +1,4 @@
-Describe "Read-Host" -Tags "CI" {
+Describe "Read-Host" -Tags "Slow","Feature" {
     Context "[Console]::ReadKey() implementation on non-Windows" {
         BeforeAll {
             $powershell = Join-Path -Path $PsHome -ChildPath "powershell"