[Visualize] Remove visualization:colorMapping advanced setting

[mbondyra]

Summary

Fixes #193682
Removes the deprecated visualization:colorMapping advanced setting.

Release notes

Thevisualization:colorMapping advanced setting for TSVB and Visualize charts has been removed. Users are encouraged to switch to Lens charts, which offer a more advanced, per-chart color mapping feature with enhanced configuration options. For more details, refer to PR #162389.

[mbondyra]

run docs-build

[elasticmachine]

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

[dej611]

First code review pass, left some comments.

[dej611]

This will return an empty object now.
If that's the expected result, why just return it?

Suggested change

	return _.mapValues({}, standardizeColor);
	return {};

And if so the standardizeColor can be removed altogether.

[markov00]

If that is the case, I also believe the entire class can be removed, because it relies on this method to get the color for a specific key.

[markov00]

and probably we can also remove the syncColors functionality that relies on this method

[mbondyra]

I simplified the MappedColors class but we cannot remove it completely because still need syncColors functionality, unless we decide to remove it from dashboard.

[markov00]

I believe we can remove this from the dashboard (it actually doesn't work anymore as you can see from your code). I will open an issue with that and we can decide later. No need to do that in this PR.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 40acd45

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
charts	129	127	-2

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
charts	253	252	-1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
charts	9.4KB	9.5KB	+18.0B
visTypeVislib	371.6KB	371.4KB	-229.0B
total			-211.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
charts	10	9	-1

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
charts	45.3KB	43.1KB	-2.2KB

Unknown metric groups

API count

id	before	after	diff
charts	268	267	-1

History

• 💔 Build #251608 failed b413da5
• 💔 Build #251594 failed 4c8cb6e
• 💛 Build #250374 was flaky 5c2ce97
• 💛 Build #250192 was flaky e02560d
• 💔 Build #250002 failed 027a6e0