Adds an xlink to the toc that points to reconciled page

[yetanothertw]

As part of replacing the Elasticsearch Built-in roles page in the Deploy and manage section with its counterpart in the Reference section this PR will retire the existing page in the Deploy and manage section and instead link to the correct, deduplicated page in the Reference section
Relates to #2218 and #2738

• I've had to update a few more links that were pointing to the page in the Deploy and manage section.

---

• The TOC with the xlink looks right on the preview (Click Built-in roles in the nav):

[github-actions]

🔍 Preview links for changed docs

• deploy-manage/monitor/stack-monitoring/collecting-log-data-with-filebeat.md
• deploy-manage/monitor/stack-monitoring/collecting-monitoring-data-with-elastic-agent.md
• deploy-manage/monitor/stack-monitoring/collecting-monitoring-data-with-metricbeat.md
• deploy-manage/monitor/stack-monitoring/es-legacy-collection-methods.md
• deploy-manage/monitor/stack-monitoring/kibana-monitoring-data.md
• deploy-manage/monitor/stack-monitoring/kibana-monitoring-elastic-agent.md
• deploy-manage/monitor/stack-monitoring/kibana-monitoring-metricbeat.md
• deploy-manage/remote-clusters/remote-clusters-cert.md
• deploy-manage/users-roles/cluster-or-deployment-auth/defining-roles.md
• deploy-manage/users-roles/cluster-or-deployment-auth/quickstart.md

[yetanothertw]

@theletterf has confirmed that adding crosslinks to TOCs was tested and ready to use. Thank you, Fabri!

[shainaraskas]

beautiful! one toc labeling suggestion (hypothetically could extend to the target page for clarity)

[shainaraskas]

to differentiate from creating your own roles

Suggested change

	- title: "Roles"
	- title: "Built-in roles"

[yetanothertw]

Thanks, @shainaraskas , that's a good point!

Fabrizio was wondering if we should somehow indicate to users that we're going to send them to the Reference section. Something like this maybe? Wdyt?

Suggested change

	- title: "Roles"
	- title: "Built-in roles (Reference)"

[shainaraskas]

I don't agree with this really. I think the ux of the links should be altered so if it's an xref, it has a little icon or something. you can do it if you want but it isn't sustainable and doesn't look cute