fix the bug: duplicate key exception

[andrzej-lecki]

The exception is thrown during rest call /v3/entity/dataset/{urn}/structuredProperties for version != 0

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[david-leifker]

Thank you!

[david-leifker]

Syntax error in the tests

/home/runner/work/datahub/datahub/metadata-io/src/main/java/com/linkedin/metadata/structuredproperties/hooks/StructuredPropertiesSoftDelete.java:33: error: ';' expected

            .collect(Collectors.toMap(Pair::getKey, Pair::getValue, (a, b) -> a)));
                                                                                 ^
1 error
> Task :metadata-io:compileJava FAILED