[Lens] Heatmap problem with colouring cells with value equal to the min value

[stratoula]

Describe the bug:
I create a lens heatmap and I see that if a cell has a metric value equal to the min value of the bands, then it is not coloured correctly.

Here the color of the right cell shpuld be blue but is transparent instead

[elasticmachine]

Pinging @elastic/kibana-vis-editors (Team:VisEditors)

[dej611]

This can be easily replicated via the kibana_sample_data_flights dataset, using the Cancelled field for the Horizontal axis and the AvgPricePerTicket as metric/cell value.

What happens is that the value is something like 491.688888881111 or similar, but the color ranges generated are rounded up to the second decimal digit 492.69 and this makes the comparison fail, leaving the cell without color.
Note that heatmap has a color continuity set to above by default, which filter any value lower than the minimum, hence the behaviour.

A possible solution is to compute the raw value, without rounding, at least in percentage mode.

[mbondyra]

Closing because it's fixed in #116170 cc @dej611