[FA] Set display_priority in cassandra spec.yaml

[coignetp]

Summary

• Set display_priority in cassandra spec.yaml based on real-world field usage data
• Fields with >10% usage are ranked by usage (descending); fields with ≤10% usage get display_priority: 0
• Regenerated conf.yaml.example to reflect the new ordering

Test plan

• Verify conf.yaml.example field ordering matches expected usage-based ordering
• Validate spec with ddev validate config -s cassandra

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.99%. Comparing base (da68177) to head (7b1f936).
⚠️ Report is 19 commits behind head on master.

Additional details and impacted files

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[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 66.67%

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