Add support for breached_password_detection.stage on auth0_attack_protection resource

[nialdaly]

Summary

This PR aims to close this issue.

[sergiught]

@nialdaly You're a rockstar ⭐ Much appreciated for already trying to contribute this to the repo. Please don't hesitate to ask for support if needed to get this in the right place.

Adding tests and making them pass for terraform will be very similar to how they are done on the Go SDK side: https://github.com/auth0/go-auth0/blob/main/CONTRIBUTING.md (I have on my TODO to update it here as well).

Also make sure to update the examples and to regenerate the docs afterwards with make docs.

[nialdaly]

Hey @sergiught thanks for the pointers! I've updated the test recordings, not 100% sure if they are correct.

[nialdaly]

When running the tests locally @sergiught I'm getting the following error. I'm not sure if its related to the updated test recording:

=== RUN   TestAccAttackProtectionBreachedPasswordDetection
    resource_auth0_attack_protection_test.go:60: Step 2/4 error: After applying this test step and performing a `terraform refresh`, the plan was not empty.
        stdout
        
        
        Terraform used the selected providers to generate the following execution
        plan. Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          # auth0_attack_protection.my_protection will be updated in-place
          ~ resource "auth0_attack_protection" "my_protection" {
                id = "terraform-20230127163011958200000006"
        
              ~ breached_password_detection {
                  ~ shields                      = [
                      + "admin_notification",
                      + "block",
                    ]
                    # (3 unchanged attributes hidden)
        
                    # (1 unchanged block hidden)
                }
        
        
                # (2 unchanged blocks hidden)
            }
        
        Plan: 0 to add, 1 to change, 0 to destroy.
--- FAIL: TestAccAttackProtectionBreachedPasswordDetection (1.20s)

[sergiught]

Great work @nialdaly 💪🏻 Fantastic contribution!

[nialdaly]

Thanks for all your help! @sergiught