WIP: Fix prism server leak

[shunping]

https://github.com/apache/beam/actions/runs/20137349393/job/57794292040?pr=37086
https://github.com/apache/beam/actions/runs/20127740080/job/57761317461

[gemini-code-assist]

Summary of Changes

Hello @shunping, 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 enhances the robustness of the JobServer's startup sequence by making the SIGINT signal handler registration more resilient to errors. By wrapping the signal.signal call in a try-except block, the server can continue its initialization even if there are issues installing the signal handler, logging a warning rather than failing. This change contributes to a more stable server operation and helps prevent scenarios that could lead to resource leaks due to improper shutdown or startup failures.

Highlights

• Robust Signal Handling: The pull request introduces a try-except block around the signal.signal call for SIGINT within the JobServer's start method.
• Error Prevention: It now gracefully handles potential exceptions during the installation of the SIGINT signal handler, logging a warning instead of crashing the server startup.

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