[Lens] Combine chart switches into one layer chart switch

[mbondyra]

Summary

This PR combines the chart type selection options into a single, layer-based chart switch. This improves the user experience by streamlining the process of switching between chart types in Lens visualizations.

Fixes #163721

Functionality:

Multilayer Charts: Switching to a compatible option (e.g., vertical bar to line) will only convert that specific layer.
Multilayer Charts: Switching to incompatible, multilayer option (e.g., horizontal to vertical) will convert all layers to the new type.
Multilayer to Single Layer: Switching to a single-layer chart type (line -> pie) will create the new chart based on the layer where you clicked the dropdown.

Benefits:

Simpler Interface: Reduces confusion by offering a single, unified way to switch chart types.
Improved Workflow: Makes it easier to customize individual layers or switch the entire visualization type.

Note: In Discover, due some architectural problems, we can only convert to compatible types so the chart switch is limited:

[elasticmachine]

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

[mbondyra]

I moved these to chart switch

[gvnmagni]

The PR does exactly what it says, works smoothly and I didn't encounter any issue while testing it.

I have a single minor comment that I will explain async since it doesn't affect in any way how the functionality works.

[dej611]

Tested locally and found no issues.
I've some minor comments on code, but will approve now to unblock merge once fixed those.

[dej611]

Can we include the check in the existing loop?

Suggested change

	suggestions.find((s) => s.changeType === 'unchanged' || s.changeType === 'reduced') ||
	suggestions.find((s) => s.keptLayerIds.some((id) => id === layerId)) ||
	suggestions[0]
	suggestions.find((s) =>
	s.changeType === 'unchanged' ||
	s.changeType === 'reduced' ||
	s.keptLayerIds.some((id) => id === layerId)
	) || suggestions[0]

[mbondyra]

actually no, because we want to give a bigger priority to unchanged or reduced types. And only if we cannot find one of these, we'll be searching through the rest (changeType: layers is what matters here)

[dej611]

It would be nice to add a comment about it then here to avoid in the future possible refactoring.

[dej611]

why this change?

[mbondyra]

I was just lazy to add another translation to the localization tests. It tests the same thing so I think it's ok to change it. Let me know if you're ok with it.

[kibana-ci]

💚 Build Succeeded

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• Commit: c7d9a02

Metrics [docs]

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
lens	563	568	+5

Async chunks

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

id	before	after	diff
lens	1.4MB	1.4MB	-1.3KB

Unknown metric groups

API count

id	before	after	diff
lens	664	669	+5

History

• 💚 Build #199353 succeeded d03aa41

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