Creating the same variable with a different scope doesn't receive an ID

[SanderKnape]

Describe the bug
When creating two variables with the same name on a project, and they both have a different scope, the variable that is created last doesn't get its ID stored in state. This results in warnings in subsequent plans/applies, and that variable can't be edited or removed.

Steps to reproduce
The following two variables both have the same name but a different scope.

resource "octopusdeploy_variable" "var1" {
  owner_id = var.project_id
  type     = "String"
  name     = "TestingFromTF"
  value    = "test1"

  scope {
    environments = [
      var.environment1
    ]
  }
}

resource "octopusdeploy_variable" "var2" {
  owner_id = var.project_id
  type     = "String"
  name     = "TestingFromTF"
  value    = "test2"

  scope {
    environments = [
      var.environment2
    ]
  }
}

When first var1 is applied, then var2, a terraform state show 'octopusdeploy_variable.var2 will show that no ID is set on this second variable.

Expected behavior
The variable should have an ID.

Errors

When trying to remove the variable with no ID, the following errors is shown:

VariableService: invalid parameter, variableID

Error: unable to delete variable

Environment and versions:

• OS: OSX
• Octopus Server Version: v2024.4 (Build 4121)
• Terraform Version: 19.7
• Octopus Terraform Provider Version: 0.32.0

Additional context
This looks like a follow up from #785.