feat(prometheus): update grafana dashboard

[battlebyte]

Summary

• new codes (http status) panel
• new consumer panel created
• panels showing 4xx/5xx from kong or upstream
• range 1m not working if Prometheus scrape is 30s. Better to create template variable range, type interval and set values like 2m,3m,5m,10m,15m,30m,1h,2h,4h,6h,12h,1d,4d,7d,14d,30d, 1m, 90s, plus auto tick most variables should be loaded
• using “on time range change” instead of “on dashboards load. In reality variables are not available when panel is loaded.
• missing variables for code and status.

Checklist

• [ ] The Pull Request has tests
• [X] A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• [ ] There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE