Add specs for WebHooks::LogExecutionWorker
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=535143) </details> <!--IssueSummary end--> Came from https://gitlab.com/gitlab-org/gitlab/-/merge_requests/187287#note_2441308903, there is no specs for `WebHooks::LogExecutionWorker`. We added specs in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/187287 to ensure the `data_consistency` behavior of the worker, but it's still missing the `#perform` specs as it should have in any worker.
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