fix: add ec2>instance launched_at field in metadata

Author: jinyoungmoonDEV

src/plugin/metadata/ec2/instance.yaml

@@ -200,7 +200,7 @@ search:
   - Key Pair: data.compute.keypair
   - Image: data.compute.image
   - Availability Zone: data.compute.az
-  - Launched At: data.compute.launched_at
+  - Launched: data.compute.launched_at
   - OS Type: data.os.os_type
   - OS Details: data.os.details
   - OS Architecture: data.os.os_arch