Related to gitlab-org/gitlab#425095 (comment 1739978289)

$ ./test-dashboard.sh ./ai-gateway/main.dashboard.jsonnet
Installed https://dashboards.gitlab.net/dashboard/snapshot/T6c67Xc0LNIIIvgSkTmzf0o4qaQkWJ0Z - ai-gateway: Overview

Update thresholds for code suggestions

• increase default threashol for code suggestions (as code generations take longer time)
• use separate apdex for completions and generations