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/common/common.kt

@@ -1,7 +1,7 @@
 package sample
 
-expect interface Input
+expect interface <!LINE_MARKER("descr='Is subclassed by AbstractInput JSInput'"), LINE_MARKER("descr='Has actuals in JS'")!>Input<!>
 
-abstract class AbstractInput : Input {
+abstract class <!LINE_MARKER("descr='Is subclassed by JSInput'")!>AbstractInput<!> : Input {
     val head: Int = null!!
 }