[py][build] Python CI - add unit test job and windows integration tests to GH runners

[cgoldberg]

User description

💥 What does this PR do?

This PR updates Python's CI workflow:

• adds a new unit-tests job to run unit tests on Ubuntu/MacOS on the GH runners
• adds Chrome/Windows, Edge/Windows to the integration test browser/os matrix on the GH runners
• adds additional test target for Mac/Safari on the GH runners

This also fixes an assertion in a unit test that was broken on Windows.

🔧 Implementation Notes

We were not currently running any Python tests on Windows in CI. We have some Windows platform-specific code in the Python bindings and not all maintainers have a Windows system to test against.

💡 Additional Considerations

This might make the CI runs slightly longer.

🔄 Types of changes

• Build/Test/CI

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PR Type

Tests

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Description

• Add unit test job for Windows and Ubuntu platforms

• Add Chrome/Windows integration test configuration

• Expand CI coverage for Windows platform testing

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Diagram Walkthrough

flowchart LR
  A["CI Workflow"] --> B["Unit Tests Job"]
  B --> C["Windows Testing"]
  B --> D["Ubuntu Testing"]
  A --> E["Integration Tests"]
  E --> F["Chrome/Windows Added"]

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File Walkthrough

	Relevant files
Tests	ci-python.yml Expand CI with unit tests and Windows support                        .github/workflows/ci-python.yml Add new unit-tests job with Windows and Ubuntu matrix Add Chrome/Windows configuration to integration tests matrix Configure Bazel test execution for unit tests +18/-0

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[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Matrix Consistency Ensure the referenced Bazel target '//py:unit' runs correctly on Windows; some tests may need skipping or platform conditionals, and shell/path separators could cause failures. run: bazel test //py:unit

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	✅ Fix syntax error in expression Suggestion Impact: The commit removed the extra '}' from the cache-key line, fixing the syntax error exactly as suggested. code diff: - cache-key: python-unit-test-${{ matrix.os }}} + cache-key: python-unit-test-${{ matrix.os }} Remove the extra closing curly brace } from the cache-key value to fix a syntax error in the GitHub Actions expression. .github/workflows/ci-python.yml [70] -cache-key: python-unit-test-${{ matrix.os }}} +cache-key: python-unit-test-${{ matrix.os }} [Suggestion processed] Suggestion importance[1-10]: 9 __ Why: The suggestion correctly identifies a syntax error in the GitHub Actions expression for cache-key which would cause the CI job to fail.	High
Update