chore: Fix ITMutableCredentialsTest in cloud-devel

[sakthivelmanii]

We need to set the spanner host based on the environment.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a test failure in ITMutableCredentialsTest by correctly configuring the Spanner host based on the test environment. It integrates the IntegrationTestEnv to provide a standardized way of obtaining SpannerOptions, which resolves issues related to environment-dependent Spanner host settings during test execution.

Highlights

• Test Environment Setup: Introduced IntegrationTestEnv as a @ClassRule to manage the test environment for ITMutableCredentialsTest.
• SpannerOptions Configuration: Updated the SpannerOptions builder to derive its initial configuration from the IntegrationTestEnv's test helper, ensuring consistent environment-specific settings.

Changelog

• google-cloud-spanner/src/test/java/com/google/cloud/spanner/it/ITMutableCredentialsTest.java
  • Imported IntegrationTestEnv and ClassRule.
  • Added a static IntegrationTestEnv instance as a @ClassRule.
  • Modified SpannerOptions instantiation to use the IntegrationTestEnv's helper for configuration.

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[gemini-code-assist]

Code Review

This pull request modifies ITMutableCredentialsTest to obtain SpannerOptions from IntegrationTestEnv, ensuring the test uses the appropriate Spanner host for the test environment. A thorough security analysis found no vulnerabilities, and no general issues were identified in the changes.