Standardize Sentry Environment Tags Across GovTool

Ensure that all **Sentry reports** consistently communicate the correct **environment** they are coming from.
Accepted environments should be:
- `dev`
- `qa`
- `preview`
- `preprod`
- `production`

There should be **no mention of "beta" environment**, as it was previously used only for Sancho and is now obsolete.

## Acceptance Criteria
- [ ] All Sentry reports correctly tag the originating environment (`dev`, `qa`, `preview`, `preprod`, or `production`).
- [ ] Any references to a **beta** environment are removed.
- [ ] Environment tagging is consistent across all parts of GovTool.