fix(frontend): Use `FRONTEND_BASE_URL` to make password reset link (#10102)

- Fixes #9215

- [x] ⚠️ Merge first:
https://github.com/Significant-Gravitas/AutoGPT_cloud_infrastructure/pull/93

### Changes 🏗️

- Use `FRONTEND_BASE_URL` instead of Host header to make password reset
redirect link

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
- [x] Resetting password gives an e-mail with a link that points to the
correct URL

#### For configuration changes:
- [x] `.env.example` is updated or already compatible with my changes
- [x] `docker-compose.yml` is updated or already compatible with my
changes
- [x] I have included a list of my configuration changes in the PR
description (under **Changes**)