fix: Fix ListTrainingJobs throttling for E2E tests

[wesk]

Problem:

End-to-end tests are failing with the following error:

An error occurred (ThrottlingException) when calling the ListTrainingJobs operation (reached max retries: 2): Rate exceeded
Error: Process completed with exit code 254.

This is because the aws cli command is calling the API too quickly.

Solution:

• Call the API more slowly, with an embedded 2-second sleep between paginated calls to avoid throttling.
• Rewrite script in Python for readability.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (90cef33) 65.13% compared to head (d667f88) 65.14%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #634   +/-   ##
=======================================
  Coverage   65.13%   65.14%           
=======================================
  Files         374      374           
  Lines       27155    27155           
=======================================
+ Hits        17688    17690    +2     
+ Misses       9467     9465    -2     

see 1 file with indirect coverage changes

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