Fix UserData not being found when added to a project

[bddvlpr]

Description

When a user data resource is nested in a particular project using project_id, a global search will not find that particular user data.

If for some reason (as the case before),the userdata list command succeeds but doesn't contain any user data itself, throw an error for that.

Reproduce bug

resource "cloudstack_project" "test-project" {
  name = "test-project"
}

resource "cloudstack_user_data" "test-userdata" {
  name = "cloudinit-test"
  userdata = base64encode(file("../some-cloudinit.yaml"))
  project_id = cloudstack_project.test-project.id
}

[Copilot]

Pull request overview

This PR fixes cloudstack_user_data read behavior when the user data is registered under a CloudStack project by ensuring the read lookup includes project_id, preventing “not found” results from global-only searches.

Changes:

• Include project_id in ListUserData parameters during resource read.
• Add a guard for empty ListUserData results to avoid indexing into an empty slice.

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