Fix flaky test pause_fileChanged_resumeShouldStartFromBeginning

[S-Saranya1]

Motivation and Context

pause_fileChanged_resumeShouldStartFromBeginning is flaking in preview builds (parameterized cases [3] and [4] - cross-TM resume). After file change, the transfer manager starts a fresh single-part upload, but the progress tracker does not populate totalBytes, causing Expecting Optional to contain a value but it was empty.

Modifications

Replaced the assertion on progress().snapshot().totalBytes() with a SHA-256 checksum comparison of the local bytes against the S3 object content, following the existing pattern in S3TransferManagerUploadIntegrationTest.

Testing

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

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