fix: Create workflow module scoped sagemaker_session to resolve test race condition

[qidewenwhen]

Issue #, if available:
Workflow integ tests (e.g. test_model_registration_with_model_repack ) have race condition with model_builder tests. The latter changes the sagemaker_session.settings._local_download_dir when doing the model_builder.build and when the test is done, the tmp file in _local_download_dir is cleaned up but the field is not reset, which blocks the workflow integ tests to upload model inference entry point file to S3. See the error thrown in

https://github.com/aws/sagemaker-python-sdk/blame/c8d1428b1176e020c5225161d0426d3dc8853289/src/sagemaker/fw_utils.py#L453-L464

        if (
            settings is not None
            and settings.local_download_dir is not None
            and not (
                os.path.exists(settings.local_download_dir)
                and os.path.isdir(settings.local_download_dir)
            )
        ):
>           raise ValueError(
                "Inputted directory for storing newly generated temporary directory does "
                f"not exist: '{settings.local_download_dir}'"
            )
E           ValueError: Inputted directory for storing newly generated temporary directory does not exist: '/tmp/sagemaker/model-builder/40e2b7d2e61c11ee99ba0242ac110002'

Description of changes: Create a separate sagemaker_session in workflow scope

Testing done: Integ tests

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
• I used the commit message format described in CONTRIBUTING
• I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
• I have checked that my tests are not configured for a specific region or account (if appropriate)
• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 231215c
• Result: FAILED
• Build Logs (available for 30 days)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.35%. Comparing base (345381e) to head (3dddbf4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4518      +/-   ##
==========================================
- Coverage   87.35%   87.35%   -0.01%     
==========================================
  Files         389      389              
  Lines       36639    36639              
==========================================
- Hits        32007    32006       -1     
- Misses       4632     4633       +1     

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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 1dd00d9
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 8ca6952
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 3704bdd
• Result: FAILED
• Build Logs (available for 30 days)

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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 3dddbf4
• Result: SUCCEEDED
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