[Security Solution][Threat Hunting Explore][Meta] EUI Visual Refresh

[angorayc]

Parent issue: #199715

Toggle EUI Borealis Theme

Running Kibana with the Borealis theme
In order to run Kibana with Borealis, you'll need to do the following:

Set the following in kibana.dev.yml: uiSettings.experimental.themeSwitcherEnabled: true
Run Kibana with the following environment variable set: KBN_OPTIMIZER_THEMES="borealislight,borealisdark,v8light,v8dark" yarn start
This will expose a toggle under Stack Management > Advanced Settings > Theme version, which you can use to toggle between Amsterdam and Borealis.

Todo list:

Tasks

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1. [Security Solution][Explore][EUI visual refresh] change usages of success to accentSecondary
2. [Security Solution][Explore][EUI visual refresh] change usages of success to textAccentSecondary
3. [Security Solution][Explore][EUI visual refresh] make sure color palettes are theme aware - [Security Solution][threat hunting explore] EUI refresh: Remove custom color hex #204631
4. [Security Solution][Explore][EUI visual refresh] rename color variables - [Security Solution][threat hunting explore] EUI refresh: Rename color variables #204908
5. [Security Solution][Explore][EUI visual refresh] remove when possible all usages of vis colors]
6. [Security Solution][Explore][EUI visual refresh] remove custom colors when possible - [Security Solution][threat hunting explore] EUI refresh: Remove custom color hex #204631
7. [Security Solution][Explore][EUI visual refresh] remove color functions in favor of color tokens - [Security Solution][threat hunting explore] EUI refresh: Remove color functions #204921
8. [Security Solution][Explore][EUI visual refresh] remove JSON tokens in favor of color tokens

[elasticmachine]

Pinging @elastic/security-threat-hunting-explore (Team:Threat Hunting:Explore)