feat(dashboards): Add incomplete bucket support to LineChartWidget
#81405
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Shamelessly adapted from #72469, with some minor changes to the code. In short, given a data delay of about 90s, any chart buckets that fall into that delay are plotted with a dotted line.
Right now this is done using a series of crimes, in which we split the series into two: a complete and an incomplete. A future version of ECharts promised to allow styling line segments of a series, but right now that's not possible. Even using a custom renderer doesn't work because in that case the segments are plotted one-by-one, which creates a "broken" line, without proper caps.
e.g.,