clean up the aws-sam-cli-managed-default bucket artifacts

### Description:

### Steps to reproduce:

Create a project and deploy to a stage multiple times.

### Observed result:

You'll see multiple artifacts but seems not needed anyways.

### Expected result:

The s3 bucket should be kept cleaned.

### Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: N/A
2. `sam --version`: Latest
3. AWS region: N/A

`Add --debug flag to command you are running`

After months of using AWS sam my bucket has reached 15 GB in file size, so I wondered why AWS SAM simply leaves the default bucket bloated with unneeded files.