fix(v3): include key in inject() warning message

Improves the warning message in the inject() function to include the key being injected.

This addresses issue #13287 where users were unable to identify which inject() call was failing without the key information in the warning message.

Changes made:
- Modified src/v3/apiInject.ts line 69 to include the injected key in the warning message
- The warning now displays: inject(<key>) can only be used inside setup() or functional components.
- This matches the pattern used in the error message on line 66

Author: kl2400033266

src/v3/apiInject.ts

@@ -66,6 +66,5 @@ export function inject(
       warn(`injection "${String(key)}" not found.`)
     }
   } else if (__DEV__) {
-    warn(`inject() can only be used inside setup() or functional components.`)
-  }
+    warn(`inject(${String(key)}) can only be used inside setup() or functional components.`)
 }