Lightning import failed for unterminated quoted field when using ks3

[lilinghai]

Bug Report

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1. Minimal reproduce step (Required)

~/.tiup/components/tidb-lightning/v7.4.0-alpha-nightly-20230901/tidb-lightning -tidb-host "xx" -pd-urls "xx:2379" -d "s3://bucket/xxx?access-key=xxx&secret-access-key=xxx&endpoint=http%3a%2f%2fks3-cn-beijing-internal.ksyuncs.com&force-path-style=false&region=Beijing&provider=ks" -c lightning.toml
Verbose debug logs will be written to /tmp/lightning.log.2023-09-04T12.29.31+0800

tidb lightning encountered error: [Lightning:Restore:ErrEncodeKV]encode kv error in file airbnbsim.t1.10498.csv:0 at offset 147500006: syntax error: unterminated quoted field
lightning.log

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master