change: Add bucket owner check

[mufaddal-rohawala]

Issue #, if available:

Description of changes:
For cases when SageMaker PySDK decides the bucket name on behalf of user, make sure that the bucket exists in Users AWS Session configured account.

Testing done:
Added unit tests.
Tested the logic by creating a test account A and created the bucket "sagemaker-us-west-2-A" in account B. With appropriate access setup, running sagemaker_session.default_bucket() in account A, the PYSDK shows the expected Error.

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.

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 084d95a
• Result: FAILED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 084d95a
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 084d95a
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: a2a95e2
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• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 7ca49c6
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 7ca49c6
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: 7ca49c6
• Result: SUCCEEDED
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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 7ca49c6
• Result: FAILED
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[mufaddal-rohawala]

FAILED tests/integ/sagemaker/jumpstart/retrieve_uri/test_transfer_learning.py::test_jumpstart_transfer_learning_retrieve_functions

above failure is a known issue unrelated to the PR, we can ignore

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 7ca49c6
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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