Spark 4.2: BloomFilter tests fail under Comet

Comet BloomFilter tests are skipped on Spark 4.2 (`assume(!isSpark42Plus, ...)`) pending investigation of BloomFilter behavior on Spark 4.2.

Affected tests:
- `CometExecRuleSuite`: "CometExecRule should allow BloomFilter mixed Comet partial and Spark final", "... mixed Spark partial and Comet final"
- `CometExec3_4PlusSuite`: "test BloomFilterMightContain can take a constant value input", "test NULL inputs for BloomFilterMightContain", "test BloomFilterMightContain from random input"

These were bulk-deferred to the generic Spark 4.2 tracker in #4126. This issue tracks the specific BloomFilter work so the `assume` guards can be removed.