Fix the issue where Patch objects cannot be updated via set_props() in WebSocket callbacks

[CNFeffery]

The new websocket callback mechanism introduced starting from version 4.2.0rc1 currently does not allow updating Patch objects via set_props() within websocket-type callbacks. This PR fixes the aforementioned issue. Closes #3758

[CNFeffery]

Based on the functional demonstration results of the local development version Dash, simulate the streaming content output effect similar to large language models:

Core callback function code:

@app.callback(
    Input("load-stream-content", "nClicks"),
    websocket=True,
    running=[[Output("load-stream-content", "loading"), True, False]],
)
async def load_stream_content(nClicks):

    for s in test_markdown:
        await asyncio.sleep(0.02)

        p = Patch()
        p += s

        set_props("markdown-content", {"markdownStr": p})