[BUG]: Text labels are drawn in the range slider #8118

Description

A scatter trace whose mode includes text draws its labels in the range slider as well as in the main plot.

Screenshots/Video

Steps to reproduce

• Open Plotly devtools and paste the following into the browser devtools console:

Plotly.newPlot(gd, {
    data: [
        {
            mode: 'lines+markers+text',
            textposition: 'top center',
            x: [1, 2, 3, 4, 5, 6, 7, 8],
            y: [3, 5, 2, 6, 4, 7, 3, 5],
            text: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
        }
    ],
    layout: {
        width: 700,
        height: 400,
        showlegend: false,
        xaxis: { rangeslider: { visible: true } }
    }
});

• Note that the text labels from the plot are visible in the range slider

Notes

• The labels in the slider are compressed and don't seem to add much value
• Nothing in the slider's code handles text, and no test or baseline covers it
• The labels appear because Cartesian.rangePlot runs each trace module's full plot routine, including rendering the text labels
• In the event that the plot only includes the text labels (mode: 'text'), how should the text labels be handled?
  • Without including them in the slider, the slider would be blank
  • I think we should keep the labels in this case
• This was discovered when working on Add auto text positioning for scatter traces #8065. The auto labels that get added in that PR branch will be omitted from the slider.