[PYG-430] 😃Enable operator for search endpoint (#530)

# Description

**Reviewer**: All code inside `examples/` is generated.

This is just enabling the `operator` for the `/instances/search/`
enpoint

<img width="1181" height="386" alt="image"
src="https://github.com/user-attachments/assets/133bbf3f-4a0b-451f-a894-1dff97b3b9e9"
/>


## Bump

- [x] Patch
- [ ] Minor
- [ ] Skip

## Changelog
### Fixed

- [alpha] The `.search` method in the QueryExecutor now support the
`operator` argument.
