Project Manager fails to create directory when one exists (#11804)

close #11758

Changelog:
- update: FileSystemService fails to create directory if one exists

lib/scala/project-manager/src/main/scala/org/enso/projectmanager/infrastructure/file/BlockingFileSystem.scala

@@ -73,7 +73,10 @@ class BlockingFileSystem[F[+_, +_]: Sync: ErrorChannel](
   /** @inheritdoc */
   override def createDir(path: File): F[FileSystemFailure, Unit] =
     Sync[F]
-      .blockingOp { FileUtils.forceMkdir(path) }
+      .blockingOp {
+        if (path.exists()) throw new FileExistsException()
+        FileUtils.forceMkdir(path)
+      }
       .mapError(toFsFailure)
       .timeoutFail(OperationTimeout)(ioTimeout)
 

lib/scala/project-manager/src/test/scala/org/enso/projectmanager/service/filesystem/FileSystemServiceSpec.scala

@@ -110,6 +110,29 @@ class FileSystemServiceSpec
       FileUtils.deleteQuietly(directoryPath)
     }
 
+    "create directory fail when one exists with the same name" in {
+      val testDir = testStorageConfig.userProjectsPath
+
+      val directoryName = "filesystem_test_create_dir_with_same_name"
+      val directoryPath = new File(testDir, directoryName)
+
+      val result1 = fileSystemService
+        .createDirectory(directoryPath)
+        .unsafeRunSync()
+
+      result1 shouldEqual Right(())
+      Files.isDirectory(directoryPath.toPath) shouldEqual true
+
+      val result2 = fileSystemService
+        .createDirectory(directoryPath)
+        .unsafeRunSync()
+
+      result2.isLeft shouldEqual true
+
+      // cleanup
+      FileUtils.deleteQuietly(directoryPath)
+    }
+
     "delete directory" in {
       implicit val client: WsTestClient = new WsTestClient(address)