[fix](function) fix error return type in mod(float32,BigInt) (#39358)

[Mryange]

Proposed changes

#39358

CREATE TABLE testdb (
    K1 BIGINT,
    K2 FLOAT
) properties("replication_num" = "1");
insert into testdb values(1,1.1);
select mod(k1,k2) from testdb;
mysql [test10]>select mod(k1,k2) from testdb;
ERROR 1105 (HY000): errCode = 2, detailMessage = (127.0.0.1)[INTERNAL_ERROR]Function mod get failed, expr is VectorizedFnCall[mod](arguments=K1, K2,return=Nullable(Float32)) and return type is Nullable(Float32).

Proposed changes

Issue Number: close #xxx

[doris-robot]

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[Mryange]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"