McuSupport: Change Kit Aspects validation check CMake variables

Before QUL 2.0, path for tools used during compilation were passed as
environment variables. Starting with 2.0, they are passed as CMake
configuration arguments. So, in order to validate a kit, the
dependencies aspect now needs to validate the CMake configuration
aspects. As 1.9 will no longer be supported, starting with this version
of Qt Creator, the environment checking code is removed.

Change-Id: I24991063dcdf9b455bd8f20226756dc2b3637f6d
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/test/unittest.cpp

@@ -82,7 +82,7 @@ void McuSupportTest::test_addNewKit()
 
 void McuSupportTest::test_addFreeRtosCmakeVarToKit()
 {
-    McuSupportOptions::updateKitEnvironment(&kit, &mcuTarget);
+    McuKitManager::updateKitEnvironment(&kit, &mcuTarget);
 
     QVERIFY(kit.hasValue(EnvironmentKitAspect::id()));
     QVERIFY(kit.isValid());