Remove CPS limitation for agent builder

[leemthompo]

[Don't merge until next serverless Kibana deploy]

Removed cross-project search limitations in agent-builder docs now that elastic/kibana#271206 is merged

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NO artificial intelligence was harmed in the making of this PR

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🔍 Preview links for changed docs

• explore-analyze/ai-features/agent-builder/limitations-known-issues.md

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Elastic Docs Style Checker (Vale)

Summary: 3 suggestions found

💡 Suggestions (3): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
explore-analyze/ai-features/agent-builder/limitations-known-issues.md	51	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
explore-analyze/ai-features/agent-builder/limitations-known-issues.md	63	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
explore-analyze/ai-features/agent-builder/limitations-known-issues.md	65	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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