Fix request body construction to only send non-nil values

[nicknisi]

Summary

Fix multiple methods in the UserManagement module to use .compact when building request bodies, preventing unnecessary nil values from being sent to the API.

This addresses a customer-reported issue where update_user was unintentionally nullifying fields that weren't explicitly provided. The fix has been extended to all similar methods for consistency.

What was the problem?

When calling methods like update_user with only some parameters:

WorkOS::UserManagement.update_user(
  id: 'user_123',
  email_verified: true
)

The method was sending ALL parameters (including nil ones) to the API:

{
  email: nil,
  first_name: nil, 
  last_name: nil,
  email_verified: true,
  external_id: nil,
  # ... more nil values
}

This caused the API to explicitly nullify fields that users didn't intend to change.

What's the solution?

Add .compact to remove nil values before sending the request:

{
  email_verified: true  # Only non-nil values sent
}

Methods Fixed

• update_user - Critical fix for user-reported issue
• create_user - Consistency and best practice
• send_invitation - Remove unnecessary nil invitation parameters
• enroll_auth_factor - Remove unnecessary nil TOTP parameters
• create_organization_membership - Remove unnecessary nil role_slug
• create_magic_auth - Remove unnecessary nil invitation_token

[greptile-apps]

PR Summary

Fixed a critical bug in UserManagement module where API requests were unintentionally nullifying unspecified fields by sending nil values. This PR adds .compact to multiple methods' request body construction.

• Fixed update_user method where customer reported unintended field nullification
• Added .compact to 5 other methods (create_user, send_invitation, enroll_auth_factor, create_organization_membership, create_magic_auth) for consistency
• Added test coverage in spec/lib/workos/user_management_spec.rb to verify only non-nil values are sent in requests
• Follows existing pattern from authorization_url method implementation

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