[test] fix partition prune unstable cases (#44976) (#45846)

cherry-pick #44976 to branch-2.1

regression-test/suites/nereids_rules_p0/partition_prune/int_as_date_partition_col.groovy

@@ -16,6 +16,7 @@
 // under the License.
 
 suite("int_as_date_partition_col") {
+    sql "set ENABLE_FOLD_CONSTANT_BY_BE=false"
     sql "drop table if exists partition_int"
     sql """CREATE TABLE partition_int(a int, dt int) PARTITION BY range(dt) (
             partition p20240101 values less than ("20240101"),

regression-test/suites/nereids_rules_p0/partition_prune/one_col_range_partition.groovy

@@ -16,6 +16,7 @@
 // under the License.
 
 suite("one_col_range_partition") {
+    sql "set ENABLE_FOLD_CONSTANT_BY_BE=false"
     sql "drop table if exists one_col_range_partition_date"
     sql """
     create table one_col_range_partition_date(a int, dt datetime, d date, c varchar(100)) duplicate key(a)

regression-test/suites/nereids_rules_p0/partition_prune/varchar_as_date_partition_col.groovy

@@ -16,6 +16,7 @@
 // under the License.
 
 suite("varchar_as_date_partition_col") {
+    sql "set ENABLE_FOLD_CONSTANT_BY_BE=false"
     sql"""drop table if exists partition_varchar;"""
     sql """CREATE TABLE partition_varchar(a int, dt varchar(10), rdt datetime) PARTITION BY list(dt) (
     partition p20240101 values in ("20240101","20240102"),