Fix unstable test_json_accessor.py

[wudidapaopao]

Fixed #519

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[auxten]

Best effort same behavior with Pandas including data types and order is our design.

This PR masks the symptom rather than fixing the root cause, which doesn't align with our testing principles:

1. Band-aid fix: Adding .to_df().sort_values('id') after execution hides a DataStore bug — the fixtures already have ORDER BY id, so if row order is non-deterministic, the issue is in DataStore's execution pipeline, not the tests.
2. Inconsistent with existing tests in the same file: Lines 72/83/94 already use the correct pattern ds.sort_values('id').to_df() (lazy, DataStore-level sort). This PR adds 7 instances of ds.to_df().sort_values('id') (pandas-level sort), which bypasses the lazy pipeline.

If a quick fix is needed, at minimum unify to ds.sort_values('id').to_df(). But the real fix should investigate why DataStore.from_df(df) loses row order from the source DataFrame.