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Fix chart's tooltip position in Firefox.

Administrator requested to merge vk/fix-bad-tooltip-position-over-charts into main

Created by: vovakulikov

Fixes https://github.com/sourcegraph/sourcegraph/issues/20098

It seems like bad position problem appears because of firefox's bug of svg.getScreenCMT() https://bugzilla.mozilla.org/show_bug.cgi?id=1610093

Since @visx/xychart tooltip uses this svg API to convert svg viewport to Dom coordinates for tooltip we have wrong wrong tooltip position. https://github.com/airbnb/visx/blob/d5fb82e42af56da4ee325ac5d2028fde52a48b01/packages/visx-event/src/localPointGeneric.ts#L12-L25

According to description of this problem of Firefox in bugzilla we have to turn off css transformation over grid item elements. (chart container) in Firefox for now.

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