Enable SpannerChangeStreamPlacementTableIT and update IntegrationTest…

[tianz101]

Re-enable SpannerChangeStreamPlacementTableIT that has been ignored.

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[gemini-code-assist]

Summary of Changes

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This pull request enables the previously ignored SpannerChangeStreamPlacementTableIT integration test. It updates the test environment configuration to support placement table-based change streams and adjusts the cleanup logging to handle the expected behavior of these tables during test teardown.

Highlights

• Test Re-enablement: Removed the @ignore annotation from SpannerChangeStreamPlacementTableIT to allow the test to run in the CI pipeline.
• Integration Test Configuration: Updated the IntegrationTestEnv initialization within the test class to explicitly enable placement table-based change streams.
• Logging Adjustment: Modified the cleanup logic in IntegrationTestEnv to log an info message instead of an error when failing to drop a placement table, acknowledging that garbage collection requirements may cause expected delays.

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R: @kennknowles for label java.

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