[Lens] Exclude the reference layer from the cursor sync hook

[stratoula]

Summary

Closes #144380

As described on the issue the bug exists when you have a Lens chart with a reference layer and the Group by this field switch set to true.

The problem is that the reference layer is a very specific layer that messes with the useCursorSync hook logic. There is no need to use these layers for this functionality. What we need here to decide if this chart should sync or not the cursor are the data layers.

[elasticmachine]

Pinging @elastic/kibana-vis-editors @elastic/kibana-vis-editors-external (Team:VisEditors)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: e7fbf57

Metrics [docs]

Async chunks

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

id	before	after	diff
expressionXY	118.7KB	118.8KB	+28.0B

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	57	63	+6
osquery	103	108	+5
securitySolution	439	445	+6
total			+19

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	65	71	+6
osquery	104	110	+6
securitySolution	516	522	+6
total			+20

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[flash1293]

Tested and works as expected, LGTM