### What changes were proposed in this pull request?
Follow the scala ```OneVsRestParams``` implementation, move ```setClassifier``` from ```OneVsRestParams``` to ```OneVsRest``` in Pyspark
### Why are the changes needed?
1. Maintain the parity between scala and python code.
2. ```Classifier``` can only be set in the estimator.
### Does this PR introduce any user-facing change?
Yes.
Previous behavior: ```OneVsRestModel``` has method ```setClassifier```
Current behavior: ```setClassifier``` is removed from ```OneVsRestModel```. ```classifier``` can only be set in ```OneVsRest```.
### How was this patch tested?
Use existing tests
Closes#25715 from huaxingao/spark-28969.
Authored-by: Huaxin Gao <huaxing@us.ibm.com>
Signed-off-by: Sean Owen <sean.owen@databricks.com>
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