import changes for d3 rendering test files

assets/rollup.config.js

assets/src/scripts/d3-rendering/accessibility.spec.js

assets/src/scripts/d3-rendering/alerts.spec.js

assets/src/scripts/d3-rendering/axes.spec.js

assets/src/scripts/d3-rendering/cursor-slider.spec.js

assets/src/scripts/d3-rendering/data-masks.spec.js

assets/src/scripts/d3-rendering/graph-tooltip.spec.js

assets/src/scripts/d3-rendering/legend.spec.js

assets/src/scripts/d3-rendering/loading-indicator.spec.js

assets/src/scripts/d3-rendering/markers.spec.js

assets/src/scripts/d3-rendering/tick-marks.spec.js