[8.6] change name guided_onboarding_sample_rule (#146062) (#146201)

# Backport

This will backport the following commits from `main` to `8.6`:
- [change name guided_onboarding_sample_rule
(#146062)](https://github.com/elastic/kibana/pull/146062)

<!--- Backport version: 8.9.7 -->

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

<!--BACKPORT
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name guided_onboarding_sample_rule (#146062)\n\n##
Summary\r\n\r\nChanges guided onboarding detection rule name to \"My
First Rule\"\r\n\r\nCC
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name guided_onboarding_sample_rule (#146062)\n\n##
Summary\r\n\r\nChanges guided onboarding detection rule name to \"My
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name guided_onboarding_sample_rule (#146062)\n\n##
Summary\r\n\r\nChanges guided onboarding detection rule name to \"My
First Rule\"\r\n\r\nCC
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BACKPORT-->

Co-authored-by: Isai <59296946+imays11@users.noreply.github.com>

x-pack/plugins/security_solution/server/lib/detection_engine/prebuilt_rules/content/prepackaged_rules/guided_onborading_sample_rule.json

@@ -23,7 +23,7 @@
   "language": "kuery",
   "license": "Elastic License v2",
   "max_signals": 1,
-  "name": "My First Alert",
+  "name": "My First Rule",
   "note": " \nThis is a test alert.\n\nThis alert does not show threat activity. Elastic created this alert to help you understand how alerts work.\n\nFor normal rules, the Investigation Guide will help analysts investigate alerts.\n\nThis alert will show once every 24 hours for each host. It is safe to disable this rule.\n",
   "query": "event.kind:\"event\"\n",
   "references": [