Avoid using production HTTP request executor unless needed in tests

Author: cmcgee1024

Sources/SwiftlyCore/SwiftlyCore.swift

@@ -45,6 +45,11 @@ public struct SwiftlyCoreContext: Sendable {
         self.currentDirectory = cwd
     }
 
+    public init(httpClient: SwiftlyHTTPClient) {
+        self.httpClient = httpClient
+        self.currentDirectory = cwd
+    }
+
     /// Pass the provided string to the set output handler if any.
     /// If no output handler has been set, just print to stdout.
     public func print(_ string: String = "", terminator: String? = nil) async {

Tests/SwiftlyTests/SwiftlyTests.swift

@@ -65,7 +65,7 @@ extension SwiftlyCoreContext {
         outputHandler: (any OutputHandler)?,
         inputProvider: (any InputProvider)?
     ) {
-        self.init()
+        self.init(httpClient: SwiftlyHTTPClient(httpRequestExecutor: httpRequestExecutor))
 
         self.mockedHomeDir = mockedHomeDir
         self.currentDirectory = mockedHomeDir ?? cwd