fix(core): add connection target handle id to result type

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

packages/core/src/utils/handle.ts

@@ -86,6 +86,7 @@ export function isValidHandle(
   const handleToCheck = handleBelow?.classList.contains('vue-flow__handle') ? handleBelow : handleDomNode
 
   const result: ValidHandleResult = {
+    handleId: null,
     handleDomNode: handleToCheck,
     isValid: false,
     connection: { source: '', target: '', sourceHandle: null, targetHandle: null },
@@ -103,6 +104,7 @@ export function isValidHandle(
     }
 
     result.connection = connection
+    result.handleId = handleId
 
     // in strict mode we don't allow target to target or source to source connections
     const isValid =