fix: jumpstart model table

[bencrabtree]

Issue #, if available:

Description of changes:
This PR changes the data source used to populate the JumpStart available models table in docs so there are no redundant entries.

Testing done:
The doc build script was ran and verified

Merge Checklist

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Tests

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[codecov-commenter]

Codecov Report

Merging #2954 (483979e) into dev (26b984a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2954   +/-   ##
=======================================
  Coverage   89.81%   89.81%           
=======================================
  Files         196      196           
  Lines       16548    16548           
=======================================
  Hits        14863    14863           
  Misses       1685     1685           

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 483979e
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 483979e
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: 483979e
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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