[Research] Audit color related customizations

[BSFishy]

Breakout issue of #4239. Audit specific places where color related things are used: hex colors, rgb functions, rgba functions, hsl functions.

Results were gotten with this script: https://gist.github.com/BSFishy/230450d7f49b449245c5b3573e499161

file name	matched strings
src/core/public/_variables.scss (fixed in #4170)	#b9d9eb, #d9e1e2, #002a3a, #163f66, #4c636f, #96a0a5, #b0b8bb
src/core/public/styles/_ace_overrides.scss	#dd0a73, #00a69b, #009926, #6b72e6, #0079a5, #900, rgb(88, 72, 246), rgb(88, 92, 246), #009926, rgb(60, 76, 114), #009926, rgb(109, 121, 222), #009926, rgb(76, 136, 107), #0079a5, #0079a5, #0079a5, #0000a2, rgb(12, 7, 255), rgb(185, 6, 144), rgb(0, 22, 142), rgb(255, 0, 0)
src/plugins/opensearch_dashboards_react/public/markdown/_markdown.scss	rgba($euiColorFullShade, 0.05), rgba($euiColorFullShade, 0.15), rgba($euiColorFullShade, 0.65), rgba($euiColorEmptyShade, 0.05), rgba($euiColorEmptyShade, 0.15), rgba($euiColorEmptyShade, 0.65)
src/plugins/vis_type_timeseries/public/application/components/vis_types/_vis_types.scss	#dfe5ef, #dfe5ef, #343741, #343741
src/plugins/vis_type_vega/public/_vega_vis.scss	#235
src/plugins/vis_type_vislib/public/vislib/visualizations/point_series/_labels.scss	#000

Files including .js, .ts, .tsx results: https://gist.github.com/BSFishy/f68ffb0544ac84f5727dd1f5e3293522

[joshuarrrr]

For https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/src/core/public/_variables.scss, I have a mitigation PR already: #4170

[joshuarrrr]

@BSFishy Can you also link to the results of the js/ts search?

[BSFishy]

@BSFishy Can you also link to the results of the js/ts search?

Updated OP