fix(amazon-s3-download): handle file, folder and bucket downloads

[zirkelc]

Description

This PR improves the amazon-s3-download script:

• if the URL like s3://bucket/foo/bar/baz.json points to a file baz.json, it will download the file as Downloads/baz.json instead of creating the full directory structure Downloads/bucket/foo/bar/baz
• if the URL like s3://bucket/foo/bar points to a folder bar, it will download the entire folder as Downloads/bucket/foo/bar/*
• if the URL like s3://bucket includes no key, it will download the entire bucket as Downloads/bucket/*

Type of change

• New script command
• Bug fix
• Improvement of an existing script
• Documentation update
• Toolkit change
• Other (Specify)

Screenshot

File download:
https://github.com/user-attachments/assets/f7c1e337-f621-4259-9202-d3f89a4db126

Folder download:
https://github.com/user-attachments/assets/c7b98e56-abbf-43ca-a823-52e4a3cbf21d

Bucket download:
https://github.com/user-attachments/assets/037e3d86-ae98-496a-a965-7de5339551ee

Dependencies / Requirements

Checklist

• I have read Contribution Guidelines

[giedreblekaite]

Thanks for clear PR and fixes!