chore: Clean up AbstractA2AServerTest

[kabir]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @kabir, 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 focuses on improving the robustness and clarity of the AbstractA2AServerTest class. It addresses potential test flakiness by introducing a timeout for a specific test method and enhances the user experience by refining error messages in key helper functions.

Highlights

• Test Robustness: Added a 3-minute timeout to the testResubscribeExistingTaskSuccess method to prevent long-running or flaky test executions.
• Error Message Clarity: Updated several error messages within task-related helper methods (saveTaskInTaskStore, getTaskFromTaskStore, ensureQueueForTask) to be more semantically accurate, improving the clarity of error reporting.

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[gemini-code-assist]

Code Review

This pull request cleans up the AbstractA2AServerTest class by adding a timeout to a test and improving error messages.