message: [bug]Fix load_examples dashboard version key name
diff: @@ -587,7 +587,7 @@ def load_world_bank_health_n_pop():
  },
  "type": "ROW"
  },
  - "VERSION_KEY": "v2"
  + "DASHBOARD_VERSION_KEY": "v2"
  }
  """)
  l = json.loads(js)
  @@ -1211,7 +1211,7 @@ def load_birth_names():
  "CHART-e8774b49"
  ]
  },
  - "VERSION_KEY": "v2"
  + "DASHBOARD_VERSION_KEY": "v2"
  }
  """)
  l = json.loads(js)
  @@ -1331,7 +1331,7 @@ def load_unicode_test_data():
  },
  "type": "ROW"
  },
  - "VERSION_KEY": "v2"
  + "DASHBOARD_VERSION_KEY": "v2"
  }
  """
  dash.dashboard_title = "Unicode Test"
  @@ -1792,7 +1792,7 @@ def load_misc_dashboard():
  },
  "type": "ROW"
  },
  - "VERSION_KEY": "v2"
  + "DASHBOARD_VERSION_KEY": "v2"
  }
  """)
  l = json.loads(js)
  @@ -2343,7 +2343,7 @@ def load_deck_dash():
  "CHART-2b87513c"
  ]
  },
  - "VERSION_KEY": "v2"
  + "DASHBOARD_VERSION_KEY": "v2"
  }
  """)
  l = json.loads(js)
  