Change QM Flame Graph to inverted icicle graph

When the flamegraph is shown on a web page it becomes very hard to use when the call stack gets deep as you have to scroll down to see anything. This is especially true for the display within the Query Monitor panel.

It would be far more straightforward to use in inverted or "icicle" graph mode. If possible it'd be nice to filter some of the options like tooltips and the `elided` colours for example as well.

Start at the Query Monitor panel's web-page flamegraph rendering and inspect how the current graph mode, tooltips, and elided colours are configured. Done means the graph is usable in inverted or icicle mode, with any agreed filtering of those options implemented.

Written by the indexing model from the issue text.