Re-enable OpenBao audit stream HTTP endpoint
## Summary
Re-enable the HTTP audit streaming endpoint for OpenBao once the self-initialization timing issue is resolved.
## Context
The HTTP audit stream was disabled as a temporary workaround for the self-initialization failure that occurs when the audit endpoint is unavailable during helm upgrade. Once #582828 is fixed, this functionality should be re-enabled to restore full audit logging capabilities.
## Implementation plan
- [x] Revert https://gitlab.com/gitlab-org/charts/gitlab/-/merge_requests/4681+.
- [x] Validate on GitLab CN or CNH.
issue