[Fix] Fix deletion of dashboard if it was trashed out of band

[pietern]

Changes

If a dashboard created by TF was trashed out of band, it could no longer be deleted by TF.

Example TF configuration:

terraform {
  required_providers {
    databricks = {
      source = "databricks/databricks"
      version = "1.58.0"
    }
  }
}

data "databricks_current_user" "me" {
  // This data source is used to get the current user's username
}

resource "databricks_dashboard" "this" {
  display_name = "Terraform test"
  parent_path = "/Workspace/Users/${data.databricks_current_user.me.user_name}/tf-dashboard-oob-deletion"
  warehouse_id = "58aa1b363649e722"
  serialized_dashboard = file("nyc_taxi_trip_analysis.lvdash.json")
}

If you apply this, and then run:

databricks lakeview trash <dashboard id>

The subsequent apply would error out with:

Error: cannot delete dashboard: dashboard [01efa39479a1128aae017018e434a747] lifecycle state [TRASHED] is not among the accepted states [Set(ACTIVE)]

It turns out trashing an already trashed dashboard returns an error.

This change guards against this condition returns success if the underlying dashboard has already been trashed.

Tests

• [x] make test run locally
• [ ] relevant change in docs/ folder
• [ ] covered with integration tests in internal/acceptance
• [ ] relevant acceptance tests are passing
• [ ] using Go SDK

[github-actions[bot]]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger: go/deco-tests-run/terraform

Inputs:

• PR number: 4235
• Commit SHA: 16503fc763686a0e86e0ace80c365f9e6c2a8534

Checks will be approved automatically on success.

[eng-dev-ecosystem-bot]

Test Details: go/deco-tests/11863430999