[8.16] [Entity Analytics] Bug: update timestamp on criticality soft delete (#196722) (#196881)

# Backport

This will backport the following commits from `main` to `8.16`:
- [[Entity Analytics] Bug: update timestamp on criticality soft delete
(#196722)](https://github.com/elastic/kibana/pull/196722)

<!--- Backport version: 8.9.8 -->

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

<!--BACKPORT [{"author":{"name":"Tiago Vila
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(#196722)\n\n## Summary\r\n\r\nThis fixes a bug with asset criticality
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(#196722)\n\n## Summary\r\n\r\nThis fixes a bug with asset criticality
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[Entity Analytics] Bug: update timestamp on criticality soft delete
(#196722) (#196810)\n\n# Backport\n\nThis will backport the following
commits from `main` to `8.x`:\n- [[Entity Analytics] Bug: update
timestamp on criticality soft
delete\n(#196722)](https://github.com/elastic/kibana/pull/196722)\n\n<!---
Backport version: 9.4.3 -->\n\n### Questions ?\nPlease refer to the
[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
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Bug: update timestamp on criticality soft delete\n(#196722)\\n\\n##
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BACKPORT-->\n\nCo-authored-by: Tiago Vila Verde
<tiago.vilaverde@elastic.co>"}}]}] BACKPORT-->

Co-authored-by: Tiago Vila Verde <tiago.vilaverde@elastic.co>

x-pack/plugins/security_solution/server/lib/entity_analytics/asset_criticality/asset_criticality_data_client.ts

@@ -342,6 +342,7 @@ export class AssetCriticalityDataClient {
           asset: {
             criticality: CRITICALITY_VALUES.DELETED,
           },
+          '@timestamp': new Date().toISOString(),
           ...getImplicitEntityFields({
             ...idParts,
             criticalityLevel: CRITICALITY_VALUES.DELETED,