Keep existing trailing slash in URL when forwarding request to insights

[lfu]

Started GET "/redhat_access/r/insights/platform/module-update-router/v1/channel?module=insights-core" for 10.0.167.131 at 2024-11-07 13:49:01 -0500
Started GET "/redhat_access/r/insights/v1/static/testing/insights-core.egg" for 10.0.167.131 at 2024-11-07 13:49:54 -0500
Started GET "/redhat_access/r/insights/v1/systems/327dd693-3204-460a-a398-526d14ebe243" for 10.0.167.131 at 2024-11-07 13:50:22 -0500
Started POST "/redhat_access/r/insights/uploads/327dd693-3204-460a-a398-526d14ebe243" for 10.0.167.131 at 2024-11-07 13:51:21 -0500
Started GET "/redhat_access/r/insights/platform/inventory/v1/hosts?insights_id=327dd693-3204-460a-a398-526d14ebe243" for 10.0.167.131 at 2024-11-07 13:51:45 -0500
Started GET "/redhat_access/r/insights/platform/insights/v1/system/5db40f5f-d099-4077-9d90-7337d0ef6ea5/reports/" for 10.0.167.131 at 2024-11-07 13:54:39 -0500

Among these requests forwarded to Insights, only reports has the trailing slash in the request URL.
To avoid a redirect in Insights, let's keep the trailing slash in the request URL.

original_request.path in this line would remove a trailing stash if it exists.

Fixes #895