fix: improve list locks integration test for postgres

[ravisiddhu]

Description

Fix: Fixed the flakiness in the list locks integration test for postgres

go test -tags=integration tests/postgres/postgres_integration_test.go
ok      command-line-arguments  14.392s

PR Checklist

• Make sure you reviewed
  CONTRIBUTING.md
• Make sure to open an issue as a
  bug/issue
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)
• Make sure to add ! if this involve a breaking change

🛠️ Fixes #1738

[gemini-code-assist]

Summary of Changes

Hello @ravisiddhu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves flakiness in the PostgreSQL list locks integration test by implementing a robust setup mechanism. It ensures that a table is consistently created and locked before the test runs, providing a stable environment for verifying lock detection. The changes also streamline the test's data handling and assertion logic to accurately reflect the expected lock state.

Highlights

• Improved Test Reliability: Introduced a new helper function, CreateAndLockPostgresTable, to programmatically create a test table and acquire an ACCESS EXCLUSIVE lock on it. This ensures a consistent and predictable state for the list locks integration test, addressing previous flakiness.
• Refactored Test Logic: The RunPostgresListLocksTest function now utilizes the new helper to set up the locked table, and the expectResults flag for the test case has been updated to true, as a lock is now guaranteed to exist.
• Updated Lock Details Structure and Verification: The lockDetails struct used for unmarshalling test results has been simplified, and the assertion logic has been modified to specifically check for the presence of AccessExclusiveLock within the Locks field, aligning with the new way lock information is retrieved.

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[gemini-code-assist]

Code Review

This pull request effectively addresses the flakiness of the list_locks integration test for PostgreSQL. The introduction of the CreateAndLockPostgresTable helper function is a solid approach to establish a deterministic state by creating a table and applying an explicit lock. The subsequent updates to the test case, including adjusting the expected results and refining the validation logic to check for a specific AccessExclusiveLock, are logical and improve the test's reliability. I have one suggestion to enhance the new helper function by using best practices for constructing SQL queries to mitigate any potential for SQL injection, even within a test context.