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/jsNameClash/js/js.kt

@@ -1,10 +1,10 @@
 package sample
 
-actual interface Input
+actual interface <!LINE_MARKER("descr='Has declaration in common module'")!>Input<!>
 
 class JSInput : AbstractInput()
 
 // ------------------------------------
 
-expect class ExpectInJsActualInJs
-actual class ExpectInJsActualInJs
+expect class <!LINE_MARKER("descr='Has actuals in JS'")!>ExpectInJsActualInJs<!>
+actual class <!LINE_MARKER!>ExpectInJsActualInJs<!>