Issue:
refactor: fix auth select flow for default users

When no `id` is passed to auth_select request is should consider default case for user authentication method and give `totp` as the next SPT.

Resolution:
<think>
PR Context:
- Title: refactor(user_auth_method): populate default user auth method
- Merged: 2024-07-10T19:23:56Z
- Files changed: 3 files
- Commits: 6 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
- Populated the User Authentication Method data statically for default users
- Auth select should give next flow as `totp` when no `id` is passed

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies a
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** refactor(user_auth_method): populate default user auth method (#5257)
Files to modify:


**crates/router/src/core/user.rs**
  Modify existing code

**crates/router/src/types/domain/user.rs**
  Add:
    - mod: pub::user_authentication_method

**crates/router/src/types/domain/user/user_authentication_method.rs**
  Modify existing code