**Related issue:** Resolves#49455
Offer `.py` script-only packages on macOS hosts, matching `.sh`.
# Checklist for submitter
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Python (`.py`) installer packages are now treated as compatible
alongside shell (`.sh`) installers on macOS and Linux.
* Python installers can now appear in software availability,
self-service installation, and setup experience selections.
* Windows behavior remains unchanged (Unix-script installers are
excluded).
* **Bug Fixes**
* Improved cross-platform compatibility matching for Unix-like hosts
when choosing the first eligible installer package.
* **Tests**
* Added and expanded unit/integration coverage for `.py` installer
compatibility across platforms and flows.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Carlo
fb0e817bd0