[VL] Change the default value of propagateIgnoreNullKeys to false

### Description

In our environment, some test cases(e.g. q87, q88 and q90) occur perf degradation.
We should set the default value of spark.gluten.sql.columnar.backend.velox.propagateIgnoreNullKeys to false

### Gluten version

main branch

Search the repository for spark.gluten.sql.columnar.backend.velox.propagateIgnoreNullKeys and inspect where its default is defined. Change the default to false, then check the q87, q88, and q90 cases or related validation to confirm the setting and performance behavior are correct.

Written by the indexing model from the issue text.