Merge together MultiplatformHighlighting and MultiplatformAnalysis tests

Basically, the former uses an old quickly-scrapped infrastructure,
which were not applicable for HMPP, so  the latter tests were written.

So, both check for one and the same thing (highlighting in MPP projects),
but MultiplatformAnalysisTest is more modern,
and has a lot of inconvenient stuff in MultiplatformHighlighting fixed
^KT-43116 Fixed

idea/testData/multiplatform/incompleteActualization/js/js.kt

@@ -1,4 +1,4 @@
 package foo
 
 actual class ExpectInCommonActualInJsOnly
-actual class ExpectInMiddleActualInJsOnly
+actual class <!LINE_MARKER("descr='Has declaration in common module'")!>ExpectInMiddleActualInJsOnly<!>

idea/testData/multiplatform/incompleteActualization/jvm/jvm.kt

@@ -1,4 +1,4 @@
 package foo
 
 actual class ExpectInCommonActualInJvmOnly
-actual class ExpectInMiddleActualInJvmOnly
+actual class <!LINE_MARKER("descr='Has declaration in common module'")!>ExpectInMiddleActualInJvmOnly<!>

idea/testData/multiplatform/incompleteActualization/jvmAndJs/jvmAndJs.kt

@@ -1,4 +1,4 @@
 package foo
 
-expect class <!NO_ACTUAL_FOR_EXPECT!>ExpectInMiddleActualInJsOnly<!>
-expect class <!NO_ACTUAL_FOR_EXPECT!>ExpectInMiddleActualInJvmOnly<!>
+expect class <!LINE_MARKER("descr='Has actuals in JS'"), NO_ACTUAL_FOR_EXPECT!>ExpectInMiddleActualInJsOnly<!>
+expect class <!LINE_MARKER("descr='Has actuals in JVM'"), NO_ACTUAL_FOR_EXPECT!>ExpectInMiddleActualInJvmOnly<!>