feat(api): integrate Vercel provider into API layer (#10190)

Co-authored-by: Daniel Barranquero <danielbo2001@gmail.com>

api/src/backend/conftest.py

@@ -565,6 +565,12 @@ def providers_fixture(tenants_fixture):
         alias="googleworkspace_testing",
         tenant_id=tenant.id,
     )
+    provider13 = Provider.objects.create(
+        provider="vercel",
+        uid="team_abcdef1234567890ab",
+        alias="vercel_testing",
+        tenant_id=tenant.id,
+    )
 
     return (
         provider1,
@@ -579,6 +585,7 @@ def providers_fixture(tenants_fixture):
         provider10,
         provider11,
         provider12,
+        provider13,
     )