Stop using `multiprocessing` in `flagging.CSVLogger` on Lite v5 (#9246)
* Fix the default demo code for the dev
* Use ClassicCSVLogger for Lite
* add changeset
* add changeset
* Revert "Use ClassicCSVLogger for Lite"
This reverts commit a89fcb11344db2623a883fac78324dc0e2f3ef93.
* Avoid using multiprocessing.Lock on Lite
* add changeset
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