… through Generate and CTE consumer (apache#62705)

Issue Number: close apache#25201, close apache#25202

Problem Summary:
Two Nereids rewrite rules moved filter conjuncts that contain
non-idempotent `UniqueFunction` calls (`rand` / `uuid` / `random_bytes`
/ `uuid_numeric`) across operators that change how many times the unique
function is evaluated, producing wrong results.

1. `PushDownFilterThroughGenerate` pushed a conjunct like `t1.id +
rand(1,100) > 5` below `LogicalGenerate`. Before the push, `rand` is
evaluated per generated row; after, it is evaluated per base row and
then the result is duplicated for every row produced by generate, so
groups of N generated rows share a single rand value instead of N
independent ones.

2. `CollectFilterAboveConsumer` registered filter conjuncts above a CTE
consumer into `cascadesContext.putConsumerIdToFilter(...)`, after which
`RewriteCteChildren.tryToConstructFilter` would OR them up and push them
into the CTE producer. For a conjunct like `rand() > 0.1`, that causes
the random filter to run on both the producer scan and each consumer
filter, and different consumers would see inconsistent rows.

Fix: in both rules, skip conjuncts whose `containsUniqueFunction()` is
true so they stay above the operator and are evaluated once per output
row.

Adjacent rules
(`PushDownFilterThroughRepeat/Window/PartitionTopN/SetOperation`,
`PullUpPredicates` and its consumers) have the same class of bug but are
out of scope for this PR and will be addressed separately.

(cherry picked from commit 55ee1fa)