[ci] add Python syntax checking workflow on changes to devtools (#5841)

## Summary

Added CI workflow and npm script for Python syntax validation in
devtools directory.

## Changes

- **What**: Added GitHub Actions workflow for Python syntax checking
with `python3 -m compileall`
- **Dependencies**: Added `python3` binary to knip ignore list

## Review Focus

Workflow triggers correctly on devtools path changes and Python syntax
validation covers all relevant files.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5841-ci-add-Python-syntax-checking-workflow-on-changes-to-devtools-27c6d73d365081b8963dd4600a233852)
by [Unito](https://www.unito.io)

knip.config.ts

@@ -20,6 +20,7 @@ const config: KnipConfig = {
       project: ['src/**/*.{js,ts}', '*.{js,ts,mts}']
     }
   },
+  ignoreBinaries: ['python3'],
   ignoreDependencies: [
     // Weird importmap things
     '@iconify/json',