[FIR] Render dot-separated FQNs instead of slash-separated ones in diagnostics

^KT-62030 fixed

analysis/low-level-api-fir/testData/contextCollector/smartCasts/andRight.txt

@@ -23,7 +23,7 @@ Smart Casts:
     FirValueParameterSymbol obj: R|kotlin/Any|
     Types:
         Foo
-        kotlin/Any
+        kotlin.Any
 
 FILE: [ResolvedTo(IMPORTS)] andRight.kt
     public abstract [ResolvedTo(STATUS)] interface Foo : R|kotlin/Any| {
@@ -40,4 +40,4 @@ FILE: [ResolvedTo(IMPORTS)] andRight.kt
 
     }
     public final [ResolvedTo(CONTRACTS)] fun consume([ResolvedTo(CONTRACTS)] obj: R|Foo|): R|kotlin/Unit| {
-    }
+    }