Add validation for traversal components in S3 path

[pintaoz-aws]

Issue #, if available:

Description of changes:
Add validation for traversal components in S3 path in download_folder()

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.65%. Comparing base (36fd82f) to head (7c94121).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5436      +/-   ##
==========================================
+ Coverage   92.01%   96.65%   +4.63%     
==========================================
  Files         210      127      -83     
  Lines       27862    20831    -7031     
==========================================
- Hits        25638    20134    -5504     
+ Misses       2224      697    -1527     

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