Newsletter doesn't deduplicate entries

### Summary

In instances where *arr adds multiple releases of the same media within a single newsletter cycle, multiple entries for that media appear in the list. Especially noticable with movies but also possible with TV shows.

### Ombi Version

4.55.2

### What platform(s) does this occur on?

Windows

### What database are you using?

MySQL

### Relevant log output

```shell

```