feat(stats): network utilization chart

[bragov4ik]

network utilization is computed as gas used divided by gas limit.
average/average also works because total=average*count and count just cancels out.

also added another initial update status state: queued for initial update
it should exempt such charts from not being shown in charts page (like those whose requirements are not met, e.g. user ops charts when user ops indexer is disabled) (closes #1342)
its scope is only one commit: 1074351

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[bragov4ik]

@coderabbitai review pls

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Get basic information about the PR
gh pr view 1341 --json title,body,author,state,additions,deletions,changedFiles

# Get the list of files changed in the PR
gh pr view 1341 --json files --jq '.files[].path'

# Get the diff for the PR to analyze the changes
gh pr diff 1341

Length of output: 36788

---

@bragov4ik I've completed my review of PR #1341 "feat(stats): network utilization chart". Here's my assessment:

Overall

This is a well-implemented feature that adds two valuable charts:

• Network utilization (gas used divided by gas limit)
• Average gas used per block

The code is well-structured and follows the established patterns in the codebase.

Strengths

1. Clean implementation: The division operation in divide.rs is robustly implemented with appropriate error handling for division by zero cases.

2. Comprehensive test coverage: You've added tests for all the new chart types and their time-based variants.

3. Proper integration: The new charts are well integrated into the existing update groups and configuration files.

4. Enhanced update states: The addition of "queued_for_initial_update" state improves the chart update tracking system.

Minor Observations

1. In data_source/kinds/data_manipulation/delta.rs, you changed DateTime::<Utc>::MAX_UTC to DateTime::<Utc>::MIN_UTC. This seems to be a bug fix for the delta calculation, which is good.

2. The workflow modification to use the JOBS environment variable should help with CI performance.

The PR looks ready to merge. Great work on implementing these useful metrics!