Close local Terraform state file when pushing to remote (#752)

## Changes
Close local Terraform state file when pushing to remote

Should help fix E2E test cleanup
```
testing.go:1225: TempDir RemoveAll cleanup: remove 
C:\Users\RUNNER~1\AppData\Local\Temp\TestAccPythonWheelTaskDeployAndRun1395546390\001\.databricks\bundle\default\terraform\terraform.tfstate: 
The process cannot access the file because it is being used by another process.
```

bundle/deploy/terraform/state_push.go

@@ -32,6 +32,7 @@ func (l *statePush) Apply(ctx context.Context, b *bundle.Bundle) error {
 	if err != nil {
 		return err
 	}
+	defer local.Close()
 
 	// Upload state file from local cache directory to filer.
 	log.Infof(ctx, "Writing local state file to remote state directory")