[Analysis API] Remove test infrastructure for obsolete on-air analysis

analysis/analysis-api/testData/components/resolveExtensionInfoProvider/extensionScopeWithPsi/multipleExtensions.kt

@@ -33,6 +33,6 @@ package main
 import rex1.*
 import rex2.*
 
-object <caret_onAirContext>MainObject : RexClass1, RexClass2 {
+object MainObject : RexClass1, RexClass2 {
     fun foo(): List<Any> = listOf(rexCallable1(), rexCallable2())
 }

analysis/analysis-api/testData/components/resolveExtensionInfoProvider/extensionScopeWithPsi/singleModule.kt

@@ -41,4 +41,4 @@ package generated
 open class GenClass2
 
 // FILE: main.kt
-fun <caret_onAirContext>main() {}
+fun main() {}