feat(sso): add support for identityProviderId in SAML flow (#9411)

Updated SAML callback URLs and relevant logic to include
identityProviderId, ensuring better handling of multiple identity
providers. Refactored client and server-side code to streamline form
interactions and validation within the SSO module.

Fix https://github.com/twentyhq/twenty/issues/9323
https://github.com/twentyhq/twenty/issues/9325

packages/twenty-server/src/engine/core-modules/sso/services/sso.service.ts

@@ -155,11 +155,11 @@ export class SSOService {
   }
 
   buildCallbackUrl(
-    identityProvider: Pick<WorkspaceSSOIdentityProvider, 'type'>,
+    identityProvider: Pick<WorkspaceSSOIdentityProvider, 'type' | 'id'>,
   ) {
     const callbackURL = new URL(this.environmentService.get('SERVER_URL'));
 
-    callbackURL.pathname = `/auth/${identityProvider.type.toLowerCase()}/callback`;
+    callbackURL.pathname = `/auth/${identityProvider.type.toLowerCase()}/callback/${identityProvider.id}`;
 
     return callbackURL.toString();
   }