[8.x] [Advanced Settings] Move security settings validation config (#216440) (#217086)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Advanced Settings] Move security settings validation config
(#216440)](#216440)

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

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

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Settings] Move security settings validation config (#216440)\n\n##
Summary\n\nIn #170234, we added
validation on\nthe security solution settings in serverless that is
enabled through
the\n`xpack.securitySolution.enableUiSettingsValidations` config
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enabled through
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Summary\n\nIn #170234, we added
validation on\nthe security solution settings in serverless that is
enabled through
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BACKPORT-->

Author: ElenaStoeva

config/serverless.security.yml

@@ -157,3 +157,6 @@ xpack.index_management.enableProjectLevelRetentionChecks: true
 # These features are disabled in Serverless until fully tested
 xpack.securitySolution.enableExperimental:
   - entityStoreDisabled
+
+## Enable uiSettings validations
+xpack.securitySolution.enableUiSettingsValidations: true

config/serverless.yml

@@ -229,7 +229,6 @@ monitoring.enabled: false
 monitoring.ui.enabled: false
 
 ## Enable uiSettings validations
-xpack.securitySolution.enableUiSettingsValidations: true
 data.enableUiSettingsValidations: true
 discover.enableUiSettingsValidations: true