[Meta] New Borealis color palette

[teresaalvarezsoler]

Default new color palette

New default color palette more aligned with Elastic brand colors and that will make users' dashboards more beautiful and visually appealing by using brighter colors that work better with both light and dark modes. We will also introduce a new high contrast palette for the visually impaired users.

Tasks

Beta Give feedback

1. [Lens] Integrate Borealis color palette #192848
   Feature:Lens Team:Visualizations +2
   
2. Allow users to try the new color palette #192849
   0 of 7
   Feature:Lens Team:Visualizations discuss impact:medium +4
   

Nice-to-haves

• Add advanced configuration to set the high contrast palette as the default

Implementation checks

Beta Give feedback

1. Color Mapping feature (does not get updated automatically by EUI)
2. Charts Tooltip
3. Legends
4. Looping Mechanism for high cardinality
5. Additional metrics in Partition charts (how do we handle change of color)
6. New color palette as Default
7. Naming of color palettes (Borealis, Kibana 7.0, Kibana 5.0...)
8. Lens interface checkup
9. EUI overall check (status colors needs to be updated so that gradients that depends on them get updated as well)
10. TSVB, Visualize, legacy tools
11. Dashboard notification and opt-in mechanism
12. severity color palette (Discover)

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)

[gvnmagni]

content edited and moved to the issue description for better visibility