Link dashboard usage to user activity logs

[florent-leborgne]

Summary

• Links the dashboard usage documentation to the detailed Kibana user activity log reference.
• Scopes the link to the self-managed 9.5 technical preview.

Depends on elastic/kibana#278897. Merge that PR first so the dashboard-event-fields anchor is available.

Related to #6941.

Validation

• vale --output=line explore-analyze/dashboards/managing.md: No new findings. The reported mapped_pages warning applies to unchanged frontmatter.
• git diff --check: Passed.
• Confirmed that the target page is published and that docs: document dashboard user activity fields (elastic/docs-content#6941) kibana#278897 adds the linked anchor.
• docs-builder: Not run because the installed binary does not support this machine's CPU instruction set.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

2. Tool and model used: Cursor with GPT-5.6 Sol.

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