Remove unused fast unmarshaller configuration for Dynamodb and DynamodbStreams

[alextwoods]

Removes the unused enableFastUnmarshaller configuration.

Motivation and Context

#6089 made the fast marshaller the default (and ignores configuration). The enableFastUnmarshaller was mostly removed from services, but was missed in ddb and ddb streams.

There should be no behavior changes from the PR, it just removes vestigial configuration.

Modifications

Removes the enableFastUnmarshaller false configuration - the default is true.

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

[sonarqubecloud]

Quality Gate passed

Issues
11 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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