fix(javascript): retain uncertainty for conditionally skipped writes

Own skipped-write interpretation at definition collection, including conditional branches, loop iterations and optional-chain arguments. Remove the narrower initializer-only representation.

Fixes #2562

src/domain/javascript/javascriptSemanticReturns.ts

@@ -155,7 +155,7 @@ const callableIdsForBinding = (
   if (
     initializer === undefined ||
     initializer.projection.length > 0 ||
-    state.conditionalInitializers.has(initializer.node)
+    state.conditionallySkippedExpressions.has(initializer.node)
   )
     return [];
   return callableIdsForNode(