Extract jitter magic number as named constant in retry logic

[Copilot]

Addresses code review feedback to improve maintainability of the retry logic for creating test suites.

Changes

• Extracted hardcoded jitter value (200ms) as const jitterMax = 200
• Placed constant alongside existing maxRetries and baseDelay for consistency

const maxRetries = 5;
const baseDelay = 500; // milliseconds
const jitterMax = 200; // milliseconds

// Later in exponential backoff calculation:
const delay = baseDelay * Math.pow(2, attempt) + Math.random() * jitterMax;

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