Refine analytics campaign reporting

[jmgasper]

Summary

• prewarm default campaign and filter queries every four hours to avoid interactive Redshift cold-start waits
• paginate clicked items 20 rows at a time and remove position from the report contract
• document and verify multi-day aws_analytics QA cohorts

Validation

• yarn lint
• yarn run build
• 27 analytics UI tests
• 17 analytics API tests
• CloudFormation template validation
• development Redshift reporting-view verification