FE: Clean up colors.ts and colors.scss

[RachelElysia]

Fleet version:

Web browser and operating system:

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💥  Actual behavior

There is one color #6A67FE that is represented by "core-fleet-blue" in colors.ts but represented by "ui-info" AND "core-vibrant-blue" in colors.scss

The colors are hard to understand by name and might have old color schemes mixed with new color schemes

🕯️ More info

The dev experience isn't great (e.g. @iansltx was reviewing a PR (ticket #25257) that updates dropdown state colors and he had a hard time understanding which color was what)

🛠️ To fix

• Have a designer define all the colors used and the names of them all
• Have a designer define those colors in Figma
• Have a frontend developer update all colors on colors.ts and colors.scss and throughout the app to match the proper names

[parsimeikoikai]

@RachelElysia I am ready and willing to help with this task once the designer has defined those colors in Figma.