Remove default role configuration

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/migrations/20251029T185308Z.sql

@@ -0,0 +1,5 @@
+-- Remove default_role column from auth_saml_configurations
+-- The default role is now hardcoded to 'MEMBER' in the application code
+-- when the SAML role attribute is missing or invalid
+
+ALTER TABLE auth_saml_configurations DROP COLUMN default_role;