Swift: recreate a default Swift package to fix test

tests/multi-language-repo/.gitignore

@@ -0,0 +1,9 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/config/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

tests/multi-language-repo/Package.swift

@@ -1,26 +1,15 @@
-// swift-tools-version: 5.7
+// swift-tools-version: 5.8
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
-    name: "helloWorld",
-    products: [
-        // Products define the executables and libraries a package produces, and make them visible to other packages.
-        .library(
-            name: "helloWorld",
-            targets: ["helloWorld"]),
-    ],
-    dependencies: [
-        // Dependencies declare other packages that this package depends on.
-        // .package(url: /* package url */, from: "1.0.0"),
-    ],
+    name: "multi-language-repo",
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
-        .target(
-            name: "helloWorld",
-            path: "swift-custom-build/helloWorld"
-        )
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .executableTarget(
+            name: "multi-language-repo",
+            path: "Sources"),
     ]
 )

tests/multi-language-repo/Sources/main.swift

@@ -0,0 +1,4 @@
+// The Swift Programming Language
+// https://docs.swift.org/swift-book
+
+print("Hello, world!")