Always enable expect 100-continue on cross region

[dagnir]

Motivation and Context

When making cross region streaming calls on S3, we need to have the 'Expect: 100-continue' header set to avoid I/O errors from sending the body unconditionally to S3 resulting in responding with a 3xx and termining the connection while the client is still writing the object.

Modifications

If cross region access is enabled, always set Expect: 100-continue for PutObject/UploadPart.

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

[dagnir]

Added no-api-surface-area-change tag since it's just a doc update.