monitoring: check dashboard build fine

[francoisferrand]

• upgrade grafanalib to latest version
• use requirements.txt to track these dependencies
• re-generate in CI to verify the json is up to date with the py source
• remove unused mongodb exporter metrics

Issue: ZENKO-5099

[DarkIsDude]

Why do we re-generate them in the CI instead of just generating and not commiting them ?

[francoisferrand]

• It allows testing/deploying more easily : i.e. the pre-generated dashboard.json is already available for loading on a platform (manually, from grafana UI) if needed. For example for troubleshooting with CS team.
• the CI check verifies they are indeed correctly generated (i.e. proper dependencies, ...)

[francoisferrand]

/approve

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