test(PRInsightsClient-massive-scaling): verify Massive Data Sets and Extreme High Bounds Scaling (Variation 2)

[aaniya22]

Closes #4373

📋 PR Summary

• Closes test(PRInsightsClient-massive-scaling): verify Massive Data Sets and Extreme High Bounds Scaling (Variation 2) #4373
• Summary: Adds massive-scaling test file for PRInsightsClient component. Tests verify the component handles extremely large datasets, loading states, zero-PR empty states, fetch error states, and 500-entry repo performance tables without layout breakage or crashes.

📸 Proof of Work

✓ 5 tests passed
✓ Duration: 2415ms
✓ vitest run output:
✓ renders all section headings without layout breakage under massive data load
✓ displays loading state before data resolves with massive dataset
✓ renders zero-PR empty state without crashing when totalPRs is 0
✓ renders error state cleanly when fetch fails under high load simulation
✓ grid items render without breaking layout with 500 repo performance entries

🏷️ PR Type

• 🧪 type: testing

✅ Checklist

• My PR has a linked issue (Closes #4373)
• I have pulled the latest main and resolved any conflicts
• Only touches components/dashboard/PRInsights/PRInsightsClient.massive-scaling.test.tsx (new file)

[Aamod-Dev]

Summary

The PR follows a known pattern of AI-generated superficial test files or inappropriate modifications that provide little to no meaningful runtime coverage and clutter the repository.

Required Changes

Issue 1

• Problem: The test file creates or simulates interactions on dummy structures, or simply adds redundant tests.
• Impact: It provides 0 real test coverage.
• Required Fix: Ensure the PR tests actual new runtime behavior and does not just add redundant tests.

[github-actions]

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