test: Optimize large test files to reduce CI execution time (#1144)

## Summary
This PR optimizes large test files to reduce test execution time and
prevent CI timeouts.

## Motivation
- Test suite was taking **341 seconds (5:41)** on main branch
- GitHub Actions CI has a 10-15 minute timeout
- Large test files (up to 221MB) were causing memory issues and slow
parsing

## Changes - Batch 1 (2 files completed)
- **AppBio QuantStudio example01.txt**: 3.5MB → 7KB (99.8% reduction)
- **Biorad Bioplex example01.xml**: 6.0MB → 1.9MB (68.4% reduction)

## Approach
- Preserve all test coverage (headers, data types, edge cases)
- Reduce data volume (keep first 8 wells, 3 cycles)
- Regenerate expected output files
- All tests passing ✅

## Progress
- [x] Batch 1: 2 files optimized
- [ ] Batch 2: Next 10 files (in progress)
- [ ] Batch 3: Additional files
- [ ] Final timing comparison

## Next Steps
This PR will be updated incrementally with additional batches of
optimized files. Each batch will:
1. Optimize ~10 large test files
2. Ensure all tests pass
3. Update this PR

Final update will include overall timing improvement factor.

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Claude <assistant@anthropic.com>

Author: 3 people

tests/json_to_csv/testdata/plate_reader.json

@@ -8,141 +8,6 @@ Reduced,Example Calc,Data Source
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