[Internal] Use generic error for missing clusters (#3938)

## Changes
<!-- Summary of your changes that are easy to understand -->
We use generic errors specified as `ErrResourceDoesNotExist` if a
cluster is in invalid state or missing.

## Tests
<!-- 
How is this tested? Please see the checklist below and also describe any
other relevant tests
-->
Unit tests
- [ ] `make test` run locally
- [ ] relevant change in `docs/` folder
- [ ] covered with integration tests in `internal/acceptance`
- [ ] relevant acceptance tests are passing
- [ ] using Go SDK

clusters/clusters_api.go

@@ -730,14 +730,12 @@ func wrapMissingClusterError(err error, id string) error {
 	// as is in the longer term, so that this keeps working.
 	if apiErr.ErrorCode == "INVALID_STATE" {
 		log.Printf("[WARN] assuming that cluster is removed on backend: %s", apiErr)
-		apiErr.StatusCode = 404
-		return apiErr
+		return databricks.ErrResourceDoesNotExist
 	}
 	// fix non-compliant error code
 	if strings.Contains(apiErr.Message,
 		fmt.Sprintf("Cluster %s does not exist", id)) {
-		apiErr.StatusCode = 404
-		return apiErr
+		return databricks.ErrResourceDoesNotExist
 	}
 	return err
 }

clusters/clusters_api_test.go

@@ -2,13 +2,13 @@ package clusters
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	// "reflect"
 
 	"testing"
 
+	"github.com/databricks/databricks-sdk-go"
 	"github.com/databricks/databricks-sdk-go/apierr"
 	"github.com/databricks/databricks-sdk-go/service/compute"
 	"github.com/databricks/terraform-provider-databricks/common"
@@ -1158,15 +1158,13 @@ func TestWrapMissingClusterError(t *testing.T) {
 	assert.EqualError(t, wrapMissingClusterError(fmt.Errorf("x"), "abc"), "x")
 	assert.EqualError(t, wrapMissingClusterError(&apierr.APIError{
 		Message: "Cluster abc does not exist",
-	}, "abc"), "Cluster abc does not exist")
+	}, "abc"), databricks.ErrResourceDoesNotExist.Error())
 }
 
 func TestExpiredClusterAssumedAsRemoved(t *testing.T) {
 	err := wrapMissingClusterError(&apierr.APIError{
 		ErrorCode: "INVALID_STATE",
 		Message:   "Cannot access cluster X that was terminated or unpinned more than Y days ago.",
 	}, "X")
-	var ae *apierr.APIError
-	assert.True(t, errors.As(err, &ae))
-	assert.Equal(t, 404, ae.StatusCode)
+	assert.EqualError(t, err, databricks.ErrResourceDoesNotExist.Error())
 }

clusters/resource_cluster_test.go

@@ -513,7 +513,7 @@ func TestResourceClusterRead(t *testing.T) {
 }
 
 func TestResourceClusterRead_NotFound(t *testing.T) {
-	_, err := qa.ResourceFixture{
+	qa.ResourceFixture{
 		Fixtures: []qa.HTTPFixture{
 			{
 				Method:   "GET",
@@ -531,8 +531,7 @@ func TestResourceClusterRead_NotFound(t *testing.T) {
 		Read:     true,
 		Removed:  true,
 		ID:       "abc",
-	}.Apply(t)
-	qa.AssertErrorStartsWith(t, err, "Cluster abc does not exist")
+	}.ApplyNoError(t)
 }
 
 func TestResourceClusterRead_Error(t *testing.T) {