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/diamondSeesTwoActuals/bottom/bottom.kt

@@ -1,6 +1,6 @@
 package sample
 
-fun main() {
+fun <!LINE_MARKER!>main<!>() {
     A().foo()
     // fromLeft should be resolved, because 'left' comes first in dependencies order!
     A().fromLeft()

idea/testData/multiplatform/diamondSeesTwoActuals/left/left.kt

@@ -1,6 +1,6 @@
 package sample
 
-actual class A /* Left */ {
-    actual fun foo(): Int = 42
+actual class <!LINE_MARKER("descr='Has declaration in common module'")!>A<!> /* Left */ {
+    actual fun <!LINE_MARKER("descr='Has declaration in common module'")!>foo<!>(): Int = 42
     fun fromLeft(): String = ""
 }

idea/testData/multiplatform/diamondSeesTwoActuals/right/right.kt

@@ -1,5 +1,5 @@
 package sample
 
-actual class A /* Right */ {
-    actual fun foo(): Int = 100500
+actual class <!LINE_MARKER("descr='Has declaration in common module'")!>A<!> /* Right */ {
+    actual fun <!LINE_MARKER("descr='Has declaration in common module'")!>foo<!>(): Int = 100500
 }

idea/testData/multiplatform/diamondSeesTwoActuals/top/top.kt

@@ -1,5 +1,5 @@
 package sample
 
-expect class A {
-    fun foo(): Int
+expect class <!LINE_MARKER("descr='Has actuals in common (2 modules)'")!>A<!> {
+    fun <!LINE_MARKER("descr='Has actuals in common (2 modules)'")!>foo<!>(): Int
 }