chore(monitoring): add triggers for login

[FilippoDeiana]

Description

Add support for authentication login triggers (operation_type: "LOGIN") so trigger functions can run on successful login events, including provider-filtered login triggers.

List of proposed changes

• Added LOGIN to supported authentication trigger operation types.
• Extended authentication trigger runtime handling to process LOGIN events and execute configured trigger functions.
• Updated auth providers to persist lastLoginAt on successful login so login events can be detected:
  • local-userpass login updates auth_users.lastLoginAt
  • custom-function login updates auth_users.lastLoginAt
  • anon-user login inserts users with lastLoginAt
• Added new e2e trigger configs:
  • authLoginTrigger.json
  • authProviderLoginLocalTrigger.json
  • authProviderLoginAnonTrigger.json
• Added new e2e function onLoginUser and registered it in function config.
• Added e2e coverage for:
  • generic login trigger firing
  • provider-filtered login trigger for local-userpass
  • provider-filtered login trigger for anon-user
• Updated two existing creation-trigger assertions to wait by event type (on_user_creation) to avoid ambiguity once login events are also emitted.

How to test the changes

1. After a successful login, verify:

• auth_users.lastLoginAt is set
• triggerEvents contains type: "on_user_login"
• providerTriggerEvents contains:
  • auth_provider_login_local-userpass for local-userpass
  • auth_provider_login_anon-user for anon-user

Modified packages

• flowerbase
• demo