Move pkg/generate unit tests to pkg/model

This patch moves all unit tests in `pkg/generate` (tests for the old
`generate.Generator`) to `pkg/model`.
Also moves all testdata to `pkg/testdata` and update
`testutil.NewModelForService` to properly build the test data path for
both `pkg/model` and `pkg/generate/code` uni tests

Author: a-hilaly

pkg/generate/enum_def_test.go renamed to pkg/model/enum_def_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"sort"

pkg/generate/apigwv2_test.go renamed to pkg/model/model_apigwv2_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/codedeploy_test.go renamed to pkg/model/model_codedeploy_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/dynamodb_test.go renamed to pkg/model/model_dynamodb_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/ec2_test.go renamed to pkg/model/model_ec2_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/ecr_test.go renamed to pkg/model/model_ecr_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/elasticache_test.go renamed to pkg/model/model_elasticache_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/lambda_test.go renamed to pkg/model/model_lambda_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/mq_test.go renamed to pkg/model/model_mq_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"

pkg/generate/rds_test.go renamed to pkg/model/model_rds_test.go

@@ -11,7 +11,7 @@
 // express or implied. See the License for the specific language governing
 // permissions and limitations under the License.
 
-package generate_test
+package model_test
 
 import (
 	"testing"