fix: typo in jumpstart manifest and refine tests

[Captainia]

Issue #, if available:

Description of changes:

Fixes a typo in JumpStart manifest enum, and refine the logic to retrieve manifest files.

Testing done:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.43%. Comparing base (d55290d) to head (84a711b).
Report is 1 commits behind head on master.

❗ Current head 84a711b differs from pull request most recent head b52c48e. Consider uploading reports for the commit b52c48e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4558   +/-   ##
=======================================
  Coverage   87.43%   87.43%           
=======================================
  Files         389      389           
  Lines       36885    36885           
=======================================
  Hits        32252    32252           
  Misses       4633     4633           

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[sagemaker-bot]

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• Commit ID: 50d1925
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[evakravi]

wanna double check: you added a unit test that would've caught this error?

[Captainia]

wanna double check: you added a unit test that would've caught this error?

Yes added a test to prevent this - in local mode it is not supposed to fetch prop metadata.

[sagemaker-bot]

AWS CodeBuild CI Report

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AWS CodeBuild CI Report

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[sagemaker-bot]

AWS CodeBuild CI Report

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[sagemaker-bot]

AWS CodeBuild CI Report

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