frontend: resolve rounding discrepancy in runner visualization

Allison Brownerequested to merge
workloads/5b9ce842a17 into master

Relates to issue #554646 (closed)

This MR was created by Duo in Session 1150394

Changes

  • Add new float fields to DedicatedMonthlyUsageType GraphQL schema to provide precise compute minutes and duration values
  • Implement expand-contract pattern by adding compute_minutes_usage and duration_minutes fields alongside existing integer fields
  • Update field descriptions to clarify rounding behavior of existing fields
  • Prepare for frontend migration to use precise float values instead of rounded integers

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