[turbopack] Fix some modification tracking bugs in TaskStorage

[lukesandberg]

Fix a few cases we track modification after making the mutation instead of before it.

For snapshotting to work correctly we need to snapshot the task before it is modified to provide a consistent view of the database (well a point in time consistent view).

[lukesandberg]

• [turbopack] Fix some modification tracking bugs in TaskStorage #89708 👈 (View in Graphite)
• canary

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing fix_modification_tracking (6998a14) with canary (a0b5d9a)}

Summary

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩