Fix data labels too dense with large single series (#42985)

* remove unused variable

* conditionally render labels sparsely if large amount of data points

* update loki snapshots

* refactor data label formatter conditions

* setup intelligent label plotting

* handle the case when there are no labels

* add sparse data label rendering to bar charts

* do not compute if no labels need to be shown or hidden

* add sparse data labeling to waterfall charts

* adjustment for large series waterfall labels

* revert change

* refactor name

* add sparse labels to stacked bar and area

* improve scaleFactor

* fix type errors

* remove unused labelFormatter

* update snapshots

* patch ECharts

- labels with no text, i.e. "", were still being considered as plot-able labels which was causing labels with real text "asdfec.." to be hidden because of overlap.
- This patch makes it so that labels with no text, i.e. "", are not considered to be candidates for overlap checking.

* update loki snapshots

* only loop over dataset once for getWaterfallChartDataDensity

* improve performance of chart data density calculations

* update loki snapshots

* update E2E spec

* update E2E spec

* increase cartesian label density allotment

* update loki snapshots

* update loki snapshots

* comment out node_modules cache since it cannot be skipped by commit and is breaking CI

* fix type errors

* Reset node modules if patches are changed

* refactor type naming

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Co-authored-by: Uladzimir Havenchyk <uladzimir.dev@gmail.com>
Co-authored-by: Uladzimir Havenchyk <125459446+uladzimirdev@users.noreply.github.com>