add `treemap_textposition` to list of flaky mocks
add `treemap_textposition` to list of flaky mocks

... this list will grow eventually.

etpinard/plotly.js,etpinard/plotly.js,etpinard/plotly.js,aburato/plotly.js,plotly/plotly.js,aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js