Fix sporadic errors when Tuist tries to preserve the SPM lockfile acr…

…oss project generations (tuist#6394)

* package-race-cond

* Some fixes

* Fix tests

Sources/TuistGenerator/Utils/SwiftPackageManagerInteractor.swift

@@ -58,12 +58,11 @@ public class SwiftPackageManagerInteractor: SwiftPackageManagerInteracting {
             .appending(try RelativePath(validating: "\(workspaceName)/xcshareddata/swiftpm"))
         let workspacePackageResolvedPath = workspacePackageResolvedFolderPath.appending(component: "Package.resolved")
 
-        if fileHandler.exists(rootPackageResolvedPath) {
-            try fileHandler.createFolder(workspacePackageResolvedFolderPath)
-            if fileHandler.exists(workspacePackageResolvedPath) {
-                try fileHandler.delete(workspacePackageResolvedPath)
+        if fileHandler.exists(rootPackageResolvedPath), !fileHandler.exists(workspacePackageResolvedPath) {
+            if !fileHandler.exists(workspacePackageResolvedPath.parentDirectory) {
+                try fileHandler.createFolder(workspacePackageResolvedPath.parentDirectory)
             }
-            try fileHandler.copy(from: rootPackageResolvedPath, to: workspacePackageResolvedPath)
+            try fileHandler.linkFile(atPath: rootPackageResolvedPath, toPath: workspacePackageResolvedPath)
         }
 
         let workspacePath = path.appending(component: workspaceName)
@@ -98,10 +97,11 @@ public class SwiftPackageManagerInteractor: SwiftPackageManagerInteracting {
             })
         )
 
-        if fileHandler.exists(rootPackageResolvedPath) {
-            try fileHandler.delete(rootPackageResolvedPath)
+        if !fileHandler.exists(rootPackageResolvedPath), fileHandler.exists(workspacePackageResolvedPath) {
+            try fileHandler.copy(from: workspacePackageResolvedPath, to: rootPackageResolvedPath)
+            if !fileHandler.exists(workspacePackageResolvedPath) {
+                try fileHandler.linkFile(atPath: rootPackageResolvedPath, toPath: workspacePackageResolvedPath)
+            }
         }
-
-        try fileHandler.linkFile(atPath: workspacePackageResolvedPath, toPath: rootPackageResolvedPath)
     }
 }