Revert "chore: package manifest local improvements (#574)" (#583)

This reverts commit 0d452db.

Author: atierian

AWSClientRuntime/Package.swift

@@ -23,15 +23,17 @@ let package = Package(
             dependencies: [
                 .product(name: "ClientRuntime", package: "ClientRuntime"),
                 .product(name: "AwsCommonRuntimeKit", package: "AwsCrt")
-            ]
+            ],
+            path: "./Sources"
         ),
         .testTarget(
             name: "AWSClientRuntimeTests",
             dependencies: [
                 "AWSClientRuntime",
                 .product(name: "SmithyTestUtil", package: "ClientRuntime"),
                 .product(name: "ClientRuntime", package: "ClientRuntime")
-            ]
+            ],
+            path: "./Tests"
         )
     ]
 )