[ubuntu] Pester tests for dotnet sdk, cmd tools and codeql (#2335)

* dotnet cmd codeql tests

* fixed dotnet tests, added codeql to toolset

* changed codeql version to wildcard

* removed unused import and a test call

* tmp

* lowercase file name

* removed sourcing invoke-tests

Co-authored-by: Leonid Lapshin <originalnoe-nazvanie@yandex.ru>

images/linux/toolsets/toolset-1604.json

@@ -69,6 +69,14 @@
                 "2.7.*",
                 "3.0.*"
             ]
+        },
+        {
+            "name": "CodeQL",
+            "platform" : "linux",
+            "arch": "x64",
+            "versions": [
+                "*"
+            ]
         }
     ],
     "android": {