[CH]Mod/Pmod throws `divide by zero` exceptions when right argument is zero

### Backend

CH (ClickHouse)

### Bug description

Mod/Pmod functions call throw `divide by zero` exceptions when right argument is zero, while the valina returns NULL

### Spark version

None

### Spark configurations

_No response_

### System information

_No response_

### Relevant logs

```bash

```

No file, test, or entry point is named. Start by reproducing Mod/Pmod in the ClickHouse backend with a zero right argument, then trace the handling of that case; done means both functions return NULL instead of throwing a divide-by-zero exception and the behavior is covered by a regression test.

Written by the indexing model from the issue text.