test: prefab AttributeValue in DescribeTableEnhancedResponseTest

[zoewangg]

Motivation and Context

DescribeTableEnhancedResponseTest.equalsHashcode uses EqualsVerifier on the DescribeTableEnhancedResponse wrapper, which delegates equals/hashCode to the low-level DescribeTableResponse. EqualsVerifier walks the full reachable type graph from DescribeTableResponse to synthesise representative values for every nested type.

If the low-level model gains a shape reachable from DescribeTableResponse that transitively exposes a Map<String, AttributeValue> or List<AttributeValue>, the graph becomes recursive: AttributeValue itself contains a Map<String, AttributeValue> (its M member) and a List<AttributeValue> (its L member). EqualsVerifier 3.15.1 detects the cycle and aborts the test with:

Recursive datastructure.
Add prefab values for one of the following types: ... AttributeValue.

Other tests in the same module already handle this exact issue by supplying AttributeValue prefab values to EqualsVerifier (see EqualsAndHashCodeTest, BatchWriteResultTest, TransactWriteItemsEnhancedResponseTest). This change applies the same idiom to DescribeTableEnhancedResponseTest so the test remains correct as the low-level model evolves.

Modifications

Updated test to add prefab values

Testing

Updated tests

Types of changes

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

(Neither: this is a test-only robustness change with no customer-visible effect.)

Checklist

• I have read the [CONTRIBUTING](https://github.com/aws/aws-sdk-java-v2/blob/master/CONTRIBUTING.md) document
• Local run of mvn install succeeds (only the affected dynamodb-enhanced module was built; full-repo mvn install was not run)
• 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 (the change IS to a test; no new behaviour to cover)
• All new and existing tests passed
• I have added a changelog entry (test-only change with no customer-facing impact; per the contribution guidelines, no changelog is required)
• My change is to implement 1.11 parity feature

License

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

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