### Why are the changes needed?
The feature `spark.sql.watchdog.forcedMaxOutputRows` is a little bit hacky, it's actually a manually implemented "limit pushdown", we already have a simple and more reliable way to achieve that by using `kyuubi.operation.result.max.rows`.
### How was this patch tested?
Pass GHA.
### Was this patch authored or co-authored using generative AI tooling?
No.
Closes#6983 from pan3793/rm-forcedMaxOutputRows.
Closes#6983
5e0707955 [Cheng Pan] Remove support for spark.sql.watchdog.forcedMaxOutputRows
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
3f4d7ca734