Key warnings are no longer associated with a component in the tree

Key warnings are supposed to be associated with the child missing the key.
It was previously associated with the owner of the parent element which is
not really as useful but now it's unfortunately associated with a fake
fiber which disappears.

packages/react-devtools-shared/src/__tests__/inspectedElement-test.js

@@ -2562,13 +2562,7 @@ describe('InspectedElement', () => {
       const data = await getErrorsAndWarningsForElementAtIndex(0);
       expect(data).toMatchInlineSnapshot(`
         {
-          "errors": [
-            [
-              "Warning: Each child in a list should have a unique "key" prop. See https://react.dev/link/warning-keys for more information.
-            at Example",
-              1,
-            ],
-          ],
+          "errors": [],
           "warnings": [],
         }
       `);

packages/react-devtools-shared/src/__tests__/store-test.js

@@ -1932,9 +1932,8 @@ describe('Store', () => {
       );
 
       expect(store).toMatchInlineSnapshot(`
-        ✕ 1, ⚠ 0
         [root]
-          ▾ <Example> ✕
+          ▾ <Example>
               <Child>
       `);
     });