Make SpannerChangeStreamPlacementTableIT against Spanner prod.

[changliiu]

SpannerChangeStreamPlacementTableIT integration test now is against Spanner prod environment.

[gemini-code-assist]

Summary of Changes

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This pull request modifies an existing integration test for Spanner change streams to ensure it runs against the production Spanner environment. This change streamlines the test setup by removing hardcoded host configurations, allowing the test to leverage default or environment-specific production settings.

Highlights

• Spanner Integration Test Environment: The SpannerChangeStreamPlacementTableIT integration test has been updated to connect to the Spanner production environment by default, removing the previous explicit configuration for a staging/sandbox host.
• Test Environment Configuration: The IntegrationTestEnv class is now instantiated using its default constructor, simplifying the setup for the Spanner change stream placement table integration test.

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[github-actions]

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R: @m-trieu for label java.

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