grafana: filter http requests total for aur on job

http_requests_total  contains requests from debuginfo.al.org host
as well as from aur.al.org so filter them on job 'aurweb'

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>
2 jobs for filter-aur-dashboard-to-host in 35 seconds (queued for 3 seconds)