FIR IDE: find FIR element by PSI one only if FIR have a real source

Also, add a check that there is only one element with the same real source

idea/testData/checker/ResolveTypeInAnnotationArgumentRuntime.kt

@@ -1,3 +1,4 @@
+// IGNORE_DUPLICATED_FIR_SOURCE_EXCEPTION
 import kotlin.reflect.KClass
 
 annotation class Ann(val value: KClass<*>)

idea/testData/highlighter/deprecated/Setter.kt

@@ -1,3 +1,4 @@
+// IGNORE_DUPLICATED_FIR_SOURCE_EXCEPTION
 fun test() {
     MyClass().test1
     MyClass().<warning descr="[DEPRECATION] 'setter for test1: Int' is deprecated. Use A instead">test1</warning> = 0