Build Python Examples in CI

[samfreund]

Description

This builds our Python examples in CI, so that we can guarantee that they are accurate and up-to-date.

closes #2236

Meta

Merge checklist:

• [x] Pull Request title is short, imperative summary of proposed changes
• [x] The description documents the what and why
• [ ] If this PR changes behavior or adds a feature, user documentation is updated
• [ ] If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• [ ] If this PR touches configuration, this is backwards compatible with settings back to v2025.3.2
• [ ] If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• [ ] If this PR addresses a bug, a regression test for it is added