CustomizeDiff Computed on password if password_resest change

[lpatte]

Description

Add a CustomizeDiff ComputedIf for password in all database user resource to ling the password attribute with the password_resest attribute.
With this, if password_resest change, the field password will be show as recomputed in the Plan.
So any other resource that use this password field will know that they must update something.

Fixes #559

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Test Configuration:

• Existing HCL configuration you used:

resource "ovh_cloud_project_database_postgresql_user" "user" {
  service_name     = "xxxxx"
  cluster_id            = "xxxxx"
  name                   = "testname"
  password_reset  = "reset1"
}

output "user_password" {
  value     = ovh_cloud_project_database_postgresql_user.user.password
  sensitive = true
}

Then update password_reset, I can see plan show update on password_reset and password.
Also user_password output is now automatically

[mig4ng]

Thank you for fixing this quickly @amstuta !

I will give it a test.