[MM-28948] Fix errcheck linter issues in import_functions.go (#30615)

Co-authored-by: Claude <noreply@anthropic.com>

server/i18n/en.json

@@ -5546,6 +5546,14 @@
     "id": "app.import.process_import_data_file_version_line.invalid_version.error",
     "translation": "Unable to read the version of the data import file."
   },
+  {
+    "id": "app.import.profile_image.open.app_error",
+    "translation": "Failed to open the profile image file: {{.FileName}}"
+  },
+  {
+    "id": "app.import.profile_image.read_data.app_error",
+    "translation": "Failed to read profile image data."
+  },
   {
     "id": "app.import.validate_bot_import_data.owner_missing.error",
     "translation": "Bot owner is missing"