docs: document Use global filters option for ES|QL layers (#6351)

[florent-leborgne]

Summary

This PR addresses #6351 by documenting the new per-layer Use global filters option for ES|QL visualizations, added in 9.5.0 and serverless (elastic/kibana#264613). The same Kibana PR renamed the Lens layer settings action and panel title from Layer settings to Settings (9.5+), so this PR also brings the existing references up to date.

• explore-analyze/visualize/esorql.md: adds an Ignore dashboard filters section explaining that, by default, an ES|QL visualization applies the dashboard filters and the KQL or Lucene query, and that turning off Use global filters in the {icon}gear Settings panel makes a layer run its query independently of them. Clarifies that this covers the dashboard's filter pills and search bar query, while the time range always applies.
• explore-analyze/visualize/lens.md, explore-analyze/visualize/charts/pie-charts.md, explore-analyze/visualize/charts/waffle-charts.md: update the Lens layer settings references to the slash form Settings/Layer settings (so both labels are covered without extra applies_to badges), and correct the layer-settings icon from app_management to {icon}gear. The 9.0-9.2 kebab-menu steps and the separate Maps "Layer settings" label are left unchanged.

The ES|QL setting is layer-specific, so it's documented on the dedicated ES|QL visualizations page (narrower scope) rather than the broader Lens page, which already links to it.

Verified against source at HEAD

• Toggle label Use global filters (xpack.lens.layerSettings.ignoreGlobalFilters) and the Settings panel label + {icon}gear gear icon (xpack.lens.layerActions.layerSettingsAction, icon: 'gear'). Confirmed the label was Layer settings on the 9.4 branch and Settings at HEAD, with the icon gear in both.
• Default is on: LENS_IGNORE_GLOBAL_FILTERS_DEFAULT_VALUE = false, so dashboard filters apply unless the option is turned off.
• Turning it off makes the layer ignore the dashboard filter pills and the KQL/Lucene query, but the time range still applies (the time filter is added unconditionally in esql.ts; confirmed by tests).

Resolves

Closes #6351

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🔍 Preview links for changed docs

• explore-analyze/visualize/charts/pie-charts.md
• explore-analyze/visualize/charts/waffle-charts.md
• explore-analyze/visualize/esorql.md
• explore-analyze/visualize/lens.md

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Elastic Docs Style Checker (Vale)

Summary: 1 suggestion found

💡 Suggestions (1): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
explore-analyze/visualize/esorql.md	143	Elastic.Wordiness	Consider using 'whether' instead of 'whether or not'.

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[leemthompo]

Unblocking on the writing side with some tiny suggestions