si-charts: Remove deprecated grid.containLabel

[akashsonune]

Other important thing is the grid.containLabel which is deprecated since v6 in favor of grid.outerBoundsMode
See - https://echarts.apache.org/en/option.html#grid.containLabel

This completely breaks our layout and we need to define this mode and other spacing to fit our needs.

For now we keep the old behavior using - LegacyGridContainLabel. I would propose to setup a followup and do it later

Originally posted by @akashsonune in #432 (comment)