[9.3] [Obs AI] Update AI Insight UI description (#250137) (#250248)

# Backport

This will backport the following commits from `main` to `9.3`:
- [[Obs AI] Update AI Insight UI description
(#250137)](#250137)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Viduni
Wickramarachchi","email":"viduni.wickramarachchi@elastic.co"},"sourceCommit":{"committedDate":"2026-01-23T15:55:06Z","message":"[Obs
AI] Update AI Insight UI description (#250137)\n\nCloses
https://github.com/elastic/obs-ai-team/issues/480\n\n## Summary\n\nAI
Insights use the Observability Agent with the merge
of\nhttps://github.com//pull/249776\n\nThis PR updates the
AI Insight subtitle copy to say `Observability\nAgent` instead of
`Elastic AI Agent` .\n\n<img width=\"1344\" height=\"96\"
alt=\"Screenshot 2026-01-22 at 7 37
39 PM\"\nsrc=\"https://github.com/user-attachments/assets/a6e5e669-ac8d-4008-9f49-316c677b1de9\"\n/>\n\n###
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the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[x] Review the
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AI Insight subtitle copy to say `Observability\nAgent` instead of
`Elastic AI Agent` .\n\n<img width=\"1344\" height=\"96\"
alt=\"Screenshot 2026-01-22 at 7 37
39 PM\"\nsrc=\"https://github.com/user-attachments/assets/a6e5e669-ac8d-4008-9f49-316c677b1de9\"\n/>\n\n###
Checklist\n\n- [x] Any text added follows [EUI's
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uses\nsentence case text and includes
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[x] Review the
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Insights use the Observability Agent with the merge
of\nhttps://github.com//pull/249776\n\nThis PR updates the
AI Insight subtitle copy to say `Observability\nAgent` instead of
`Elastic AI Agent` .\n\n<img width=\"1344\" height=\"96\"
alt=\"Screenshot 2026-01-22 at 7 37
39 PM\"\nsrc=\"https://github.com/user-attachments/assets/a6e5e669-ac8d-4008-9f49-316c677b1de9\"\n/>\n\n###
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uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[x] The PR description includes the appropriate Release Notes
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the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
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BACKPORT-->

Co-authored-by: Viduni Wickramarachchi <viduni.wickramarachchi@elastic.co>

Author: kibanamachine

x-pack/solutions/observability/plugins/observability_agent_builder/public/components/ai_insight/ai_insight.tsx

@@ -131,7 +131,7 @@ export function AiInsight({ title, fetchInsight, buildAttachments }: AiInsightPr
               <EuiText size="s" css={{ color: euiTheme.colors.textSubdued }}>
                 <span>
                   {i18n.translate('xpack.observabilityAgentBuilder.aiInsight.description', {
-                    defaultMessage: 'Get helpful insights from our Elastic AI Agent',
+                    defaultMessage: 'Get helpful insights from our Observability Agent',
                   })}
                 </span>
               </EuiText>