Spaces in serverless

[joepeeples]

Contributes to https://github.com/elastic/security-docs-internal/issues/31. Also fixes #6019.

Preview

• Click the link in the comment below, then in the Security card click View serverless docs.
• Navigate to: Elastic Security UI → Spaces and Elastic Security

Note that we're no longer trying to omit "Kibana" from serverless docs, as that no longer seems to be a requirement (it's all over the UI). So this content mostly mirrors the ESS version in sometimes referring to spaces as "KIbana spaces," though in some instances this has been shortened to just "spaces" for simplicity.

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