all tests are now marked with proper tag

also, update build.psm1 to be more flexible

test/powershell/Language/Classes/Scripting.Classes.Exceptions.Tests.ps1

@@ -1,4 +1,4 @@
-Describe 'Exceptions flow for classes' -Tags "DRT" {
+Describe 'Exceptions flow for classes' -Tags "CI" {
     
     $canaryHashtable = @{}
 

test/powershell/Language/CompletionTestSupport.psm1

@@ -98,7 +98,7 @@ function Test-Completions
     {
         foreach ($test in $TestCases)
         {
-            Describe $test.Description {
+            Describe $test.Description -Tags "CI" {
                 $hash = $Test.TestInput
                 $results = Get-Completions @hash