Simplify local dependency injection for examples (#612)

See issue #536 

All the examples are now depending on the runtime library located at
`../..`. The `Package.swift` files contain a commented line with the
`.package` to use when user wants to fetch the runtime from GitHub.

---------

Co-authored-by: Sebastien Stormacq <stormacq@amazon.lu>

Examples/MultiSourceAPI/Package.swift

@@ -2,9 +2,6 @@
 
 import PackageDescription
 
-// needed for CI to test the local version of the library
-import struct Foundation.URL
-
 let package = Package(
     name: "MultiSourceAPI",
     platforms: [.macOS(.v15)],
@@ -12,7 +9,12 @@ let package = Package(
         .executable(name: "MultiSourceAPI", targets: ["MultiSourceAPI"])
     ],
     dependencies: [
-        .package(url: "https://github.com/awslabs/swift-aws-lambda-runtime.git", from: "2.0.0"),
+        // For local development (default)
+        .package(name: "swift-aws-lambda-runtime", path: "../.."),
+
+        // For standalone usage, comment the line above and uncomment below:
+        // .package(url: "https://github.com/awslabs/swift-aws-lambda-runtime.git", from: "1.0.0"),
+
         .package(url: "https://github.com/awslabs/swift-aws-lambda-events.git", from: "1.0.0"),
     ],
     targets: [
@@ -26,30 +28,3 @@ let package = Package(
         )
     ]
 )
-
-if let localDepsPath = Context.environment["LAMBDA_USE_LOCAL_DEPS"],
-    localDepsPath != "",
-    let v = try? URL(fileURLWithPath: localDepsPath).resourceValues(forKeys: [.isDirectoryKey]),
-    v.isDirectory == true
-{
-    let indexToRemove = package.dependencies.firstIndex { dependency in
-        switch dependency.kind {
-        case .sourceControl(
-            name: _,
-            location: "https://github.com/awslabs/swift-aws-lambda-runtime.git",
-            requirement: _
-        ):
-            return true
-        default:
-            return false
-        }
-    }
-    if let indexToRemove {
-        package.dependencies.remove(at: indexToRemove)
-    }
-
-    print("[INFO] Compiling against swift-aws-lambda-runtime located at \(localDepsPath)")
-    package.dependencies += [
-        .package(name: "swift-aws-lambda-runtime", path: localDepsPath)
-    ]
-}