## Description
Fixes WhatsApp embedded signup failing with "No WABA scope found in
token." Meta recently changed which scopes embedded-signup tokens carry
(whatsapp_business_manage_events instead of
whatsapp_business_management), which tripped a brittle scope-string
check. That check was redundant anyway — PhoneInfoService already
verifies the token's access to the specific WABA by calling its
/phone_numbers endpoint right before it. This removes the obsolete
TokenValidationService and relies on the functional check.
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
## Checklist:
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
