Fix GetType() bad pattern and related issues in tests (#3134)

* Fix GetType() bad pattern and related issues in tests

$var.GetType() can raise an exception in tests so we should check $var
before make the call. A large part of the tests does not make this
check.
I start with searching ".GetType()" but discovered many related issues
in tests (reduntant and unneeded tests, "throw" bad pattens, bugs,
formattings (sorry!) and so on) - I had to fix them too.

* Fix after code review
* Second wave of migration GetType() -> BeOfType
Removed 'GetType().Name' patterns.

test/powershell/Language/Scripting/Debugging/DebuggerScriptTests.Tests.ps1

@@ -290,17 +290,13 @@ Describe "Unit tests for various script breakpoints" -Tags "CI" {
         {
             & $command
 
-	        It "Script should fail to verify exception" {
-		        $false | Should Be $true
-	        }
+            throw "No Exception!"
         }
         catch
         {
-            $type = $_.Exception.GetType().Name
-
-	        It "Script failed expected exception" {
-		        $type | Should Be $exception
-	        }
+            It "Script failed expected exception" {
+                $_.Exception.GetType().Name | Should Be $exception
+            }
         }
     }