KT-32366: Add tests for right preview window

- also, fix missing test generation in `GenerateTests` bunch files (which was introduced in e54b43ba)

idea/testData/scratch/rightPanelOutput/bigSequentialOutputs.comp.preview

@@ -0,0 +1,22 @@
+Hello world
+
+Hello world
+
+
+
+Hello world
+Hello world
+Hello world
+
+Hello world
+Hello world
+<fold text='Hello world...'>Hello world
+Hello world</fold>
+
+<fold text='Hello world...'>Hello world
+Hello world
+Hello world</fold>
+
+Hello world
+Hello world
+Hello world

idea/testData/scratch/rightPanelOutput/bigSequentialOutputs.kts

@@ -0,0 +1,20 @@
+// PREVIEW_ENABLED: TRUE
+println("Hello world")
+
+for (x in 1..1) {
+    println("Hello world")
+}
+
+for (x in 1..3) {
+    println("Hello world")
+}
+
+for (x in 1..4) {
+    println("Hello world")
+}
+
+println(List(3) { "Hello world" }.joinToString(separator = "\n"))
+
+println(
+    List(3) { "Hello world" }.joinToString(separator = "\n")
+)

idea/testData/scratch/rightPanelOutput/shortExpression.longOutput.singleTop.comp.preview

@@ -0,0 +1,3 @@
+<fold text='First string...'>First string
+Second string
+Third string</fold>

idea/testData/scratch/rightPanelOutput/shortExpression.longOutput.singleTop.kts

@@ -0,0 +1,2 @@
+// PREVIEW_ENABLED: TRUE
+println("First string\nSecond string\nThird string")

idea/testData/scratch/rightPanelOutput/shortExpression.shortOutput.singleTop.comp.preview

@@ -0,0 +1 @@
+Single string

idea/testData/scratch/rightPanelOutput/shortExpression.shortOutput.singleTop.kts

@@ -0,0 +1,2 @@
+// PREVIEW_ENABLED: TRUE
+println("Single string")