Fix Variant time microsecond JSON formatting#10173
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What changed
This updates Variant
TimeJSON formatting to trim only trailing zeros from fractional microseconds.Why
The previous formatter used
trim_matches('0'), which removed leading zeros as well as trailing zeros. That could change values like.010010into.1001during JSON serialization.Validation
cargo fmt --package parquet-variant-jsoncargo test -p parquet-variant-json test_time_to_json