Add Python example for slowly updating global window side input

[karthik-dev56]

This PR adds a Python snippet demonstrating a slowly updating global window side input,
similar to the existing Java example in Beam docs. The snippet uses a dummy side input
for local testing and can later be extended with PeriodicImpulse for real pipelines.

• Adds run_side_input_example() in snippets.py
• Demonstrates cross-join of main input with side input
• Outputs results with print() for easy verification

Closes #35935

[gemini-code-assist]

Summary of Changes

Hello @karthik-dev56, 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 updates the Apache Beam documentation to include a Python example for implementing a slowly updating global window side input. By replacing a placeholder with a reference to a new code snippet, the change aims to provide Python users with a practical demonstration of this pattern, mirroring existing Java examples and enhancing the comprehensiveness of the Beam documentation.

Highlights

• Documentation Update: The side-inputs.md documentation file has been modified to reference a new Python code sample.
• Python Code Sample Link: The "No sample present." placeholder for Python examples of slowly updating global window side inputs has been replaced with a code_sample shortcode pointing to SideInputPatternSlowUpdateGlobalWindowSnip1 in sdks/python/apache_beam/examples/snippets/snippets.py.

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[karthik-dev56]

Hi, I’ve fixed the snippet markers and paths. The CI should now pass for the website build. Please let me know if any further changes are needed.

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[karthik-dev56]

Hi @apache/beam-website-team, could you please review this PR when you have time? I’ve added the Python example and fixed snippet markers for the website build

[github-actions]

This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@beam.apache.org list. Thank you for your contributions.

[github-actions]

This pull request has been closed due to lack of activity. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.