Limit retries for SAST FP worker to 5

What does this MR do and why?

Reduce the number of retries for the sidekiq worker Vulnerabilities::TriggerFalsePositiveDetectionWorkflowWorker to 5, default is 25. This is to prevent retries and the queue building up because of this. The retries are majorly happening because of the error being thrown by a service Ai::DuoWorkflows::StartWorkflowService, we can remove this retry count limit until the issue https://gitlab.com/gitlab-org/gitlab/-/issues/584239 is fixed.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/584239

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