Fix KT-10764 IDEA doesn't show overload conflict between constructor and function...

When checking for overloads in package, consider functions and top-level class constructors as possibly conflicting between each other. NB OverloadUtil uses containing package scope from module descriptor.

Change diagnostic message for CONFLICTING_OVERLOAD: it's misleading in case of fun vs constructor conflict.

Add custom multifile test for diagnostics in IDE (probably not the best; should preprocess file content if it's required to check highlighting in multiple files, not only in the first file).

Add test for KT-10765 Incremental compilation misses overload conflict between constructor and function ...

jps-plugin/testData/incremental/classHierarchyAffected/secondaryConstructorAdded/build.log

@@ -4,9 +4,19 @@ End of files
 Compiling files:
 src/A.kt
 End of files
+COMPILATION FAILED
+'public constructor A(x: kotlin.String)' conflicts with another declaration: public constructor A(x: kotlin.String)
+
+
+Cleaning output files:
+out/production/module/AConstructorFunctionKt.class
+out/production/module/META-INF/module.kotlin_module
+End of files
+Compiling files:
+src/A.kt
+End of files
 Cleaning output files:
 out/production/module/AChild.class
-out/production/module/AConstructorFunctionKt.class
 out/production/module/CreateAFromIntKt.class
 out/production/module/CreateAFromStringKt.class
 out/production/module/META-INF/module.kotlin_module
@@ -14,23 +24,6 @@ out/production/module/UseAKt.class
 End of files
 Compiling files:
 src/AChild.kt
-src/AConstructorFunction.kt
-src/createAFromInt.kt
-src/createAFromString.kt
-src/useA.kt
-End of files
-COMPILATION FAILED
-Overload resolution ambiguity: 
-public constructor A(x: kotlin.String) defined in A
-public fun A(x: kotlin.String): A defined in root package
-
-
-Cleaning output files:
-out/production/module/A.class
-End of files
-Compiling files:
-src/A.kt
-src/AChild.kt
 src/createAFromInt.kt
 src/createAFromString.kt
 src/useA.kt