fix: JumpStart list models flaky tests

[Captainia]

Issue #, if available:

Description of changes:

This change fixes the list models flaky unittests by making sure the mocks are set up correctly.

Testing done:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.38%. Comparing base (327638e) to head (8a978b1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4525   +/-   ##
=======================================
  Coverage   87.38%   87.38%           
=======================================
  Files         389      389           
  Lines       36776    36776           
=======================================
+ Hits        32135    32136    +1     
+ Misses       4641     4640    -1     

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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: b32ac3c
• Result: SUCCEEDED
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[evakravi]

that's a bit concerning that this does not cause any unit tests to fail

[Captainia]

It's because these keys are exactly the same. I was thinking to add a hypothetical new key in a test, but then I feel it should be done when we actually change the slots in JumpStartModelHeader. Let me know if you feel strongly to add it now

[evakravi]

so you're say it happens to work now, cause they're the same. i guess that's fine. what about the spec keys though?

[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 8a978b1
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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