Github Blocks use an URL transformer passed to `Requests` to convert web
URLs to the API URLs. This doesn't always work with the anti-SSRF URL
pinning mechanism that was implemented in #8531.
### Changes 🏗️
In `Requests.request(..)`:
- Apply `validate_url` *after* `extra_url_validator`, to prevent
mismatch between `pinned_url` and `original_hostname`
- Simplify logic & add clarifying comments
### 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] Tested the github blocks that had the issue
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Co-authored-by: Reinier van der Leer <pwuts@agpt.co>
