Some configuration changes aren't reflected during calls to `Plotly.react`

[camdecoster]

Description

Some configuration changes aren't reflected during calls to Plotly.react. This includes mode bar button title changes, icons, etc. Toggling display of the logo (among other config options) seems to force a full update that reflects all the config changes. This is discussed a bit here in #6394.

Steps to reproduce

• Be on master
• Launch Plotly DevTools
• Open mock line_scatter (other mocks could work, but I know this one does)
• Run the following snippet to update the mode bar buttons:

  let toggle = true
  
  Plotly.react(
    gd,
    gd.data,
    gd.layout,
    {
      displaylogo: false,
      modeBarButtonsToAdd: [
        {
          name: 'custombutton',
          title: toggle ? 'Take PICTURE' : 'Record MOVIE',
          icon: toggle ? Plotly.Icons.camera : Plotly.Icons.movie,
          click: () => {}
        },
      ],
      modeBarButtonsToRemove: [
        "autoscale",
        "pan2d",
        "lasso2d",
        "resetScale2d",
        "select2d",
        "toImage",
        "zoom",
        "zoomIn2d",
        "zoomOut2d"
      ]
    }
  )

• Run this other snippet to update the label of the custom button:

  toggle = false
  
  Plotly.react(
    gd,
    gd.data,
    gd.layout,
    {
      displaylogo: false,
      modeBarButtonsToAdd: [
        {
          name: 'custombutton',
          title: toggle ? 'Take PICTURE' : 'Record MOVIE',
          icon: toggle ? Plotly.Icons.camera : Plotly.Icons.movie,
          click: () => {}
        },
      ],
      modeBarButtonsToRemove: [
        "autoscale",
        "pan2d",
        "lasso2d",
        "resetScale2d",
        "select2d",
        "toImage",
        "zoom",
        "zoomIn2d",
        "zoomOut2d"
      ]
    }
  )

• Note that the button title and icon have not updated

Notes

• This issue was split off from enable updating the config of a plot without changing other parameters #6394 as mentioned here
• It appears that this issue was also written up downstream in Config not reactive in some cases cshaa/svelte-plotly.js#10