Support `iteration` in GLQL
## Summary
We should support iterations with GLQL for both viewing and filtering. Ideally the value the user passes is readily available to them from the UI (i.e. iteration title).
- [x] Support display `iteration` in search results
- [~] Support filtering by a specific `iteration` using iteration title
- [x] Support searching by `iteration` id
- [x] Support searching by `cadence` id
issue