fix: chart tool chinese font display and raise error

[hjlarry]

Summary

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Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

fixed 2 errors:

1. fix The Chinese font is not available in the chart tool #10777
2. when you run the tool to generate a bar, then change params to generate another bar will raise:

[on_tool_start] ToolCall:bar_chart
{'data': '15000', 'x_axis': '测试汉字'}
C:\Users\hejl\PycharmProjects\dify\api\core\tools\provider\builtin\chart\tools\bar.py:31: UserWarning: Starting a Matplotlib GUI outside of the main thread will likely fail.
  flg, ax = plt.subplots(figsize=(10, 8))
C:\Users\hejl\PycharmProjects\dify\api\core\tools\provider\builtin\chart\tools\bar.py:35: UserWarning: set_ticklabels() should only be used with a fixed number of ticks, i.e. after set_ticks() or using a FixedLocator.
  ax.set_xticklabels(axis, rotation=45, ha="right")
Exception ignored in: <function Image.__del__ at 0x0000018D0AC99080>
Traceback (most recent call last):
  File "C:\Users\hejl\.pyenv\pyenv-win\versions\3.12.0\Lib\tkinter\__init__.py", line 4081, in __del__
    self.tk.call('image', 'delete', self.name)
RuntimeError: main thread is not in main loop
2024-11-24 21:31:55,681.681 INFO [Thread-9 (process_request_thread)] [_internal.py:97] - 127.0.0.1 - - [25/Nov/2024 13:31:55] "OPTIONS /console/api/apps/d0f351d8-946d-4a62-a074-dc8ac0bf2e11/workflows/draft HTTP/1.1" 200 -
2024-11-24 21:31:55,710.710 INFO [Thread-11 (process_request_thread)] [_internal.py:97] - 127.0.0.1 - - [25/Nov/2024 13:31:55] "POST /console/api/apps/d0f351d8-946d-4a62-a074-dc8ac0bf2e11/workflows/draft HTTP/1.1" 200 -
Exception ignored in: <function Variable.__del__ at 0x0000018D0AC02AC0>
Traceback (most recent call last):
  File "C:\Users\hejl\.pyenv\pyenv-win\versions\3.12.0\Lib\tkinter\__init__.py", line 410, in __del__
    if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: main thread is not in main loop
Exception ignored in: <function Variable.__del__ at 0x0000018D0AC02AC0>
Traceback (most recent call last):
  File "C:\Users\hejl\.pyenv\pyenv-win\versions\3.12.0\Lib\tkinter\__init__.py", line 410, in __del__
    if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: main thread is not in main loop
Exception ignored in: <function Variable.__del__ at 0x0000018D0AC02AC0>
Traceback (most recent call last):
  File "C:\Users\hejl\.pyenv\pyenv-win\versions\3.12.0\Lib\tkinter\__init__.py", line 410, in __del__
    if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: main thread is not in main loop
Exception ignored in: <function Variable.__del__ at 0x0000018D0AC02AC0>
Traceback (most recent call last):
  File "C:\Users\hejl\.pyenv\pyenv-win\versions\3.12.0\Lib\tkinter\__init__.py", line 410, in __del__
    if self._tk.getboolean(self._tk.call("info", "exists", self._name)):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: main thread is not in main loop
Tcl_AsyncDelete: async handler deleted by the wrong thread

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Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods