[8.19] [SLO] Update user in audit trail for enable/disable slo (elastic#218739) (elastic#219400)

# Backport

This will backport the following commits from `main` to `8.19`:
- [[SLO] Update user in audit trail for enable/disable slo
(elastic#218739)](elastic#218739)

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

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

<!--BACKPORT [{"author":{"name":"Bailey
Cash","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-04-22T21:41:25Z","message":"[SLO]
Update user in audit trail for enable/disable slo (elastic#218739)\n\n##
Summary\n\nUpdate user when an SLO is enabled or
disabled.","sha":"6e67bf46a488caeed4be44e872783c82fd42b9ed","branchLabelMapping":{"^v9.1.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","backport
missing","Team:obs-ux-management","backport:version","v9.1.0","v8.19.0"],"title":"[SLO]
Update user in audit trail for enable/disable
slo","number":218739,"url":"https://github.com/elastic/kibana/pull/218739","mergeCommit":{"message":"[SLO]
Update user in audit trail for enable/disable slo (elastic#218739)\n\n##
Summary\n\nUpdate user when an SLO is enabled or
disabled.","sha":"6e67bf46a488caeed4be44e872783c82fd42b9ed"}},"sourceBranch":"main","suggestedTargetBranches":["8.19"],"targetPullRequestStates":[{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/218739","number":218739,"mergeCommit":{"message":"[SLO]
Update user in audit trail for enable/disable slo (elastic#218739)\n\n##
Summary\n\nUpdate user when an SLO is enabled or
disabled.","sha":"6e67bf46a488caeed4be44e872783c82fd42b9ed"}},{"branch":"8.19","label":"v8.19.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Bailey Cash <[email protected]>

Author: kibanamachine