refactor: drop tsx

[viceice]

Changes

No longer needed, we can use node directly 💪

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[jamietanna]

Nice 🥳

[secustor]

🚀

[github-actions]

🎉 This PR is included in version 43.18.0 🎉

The release is available on:

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• 43.18.0

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[jamietanna]

FYI, the docs site is failing to build due to this - investigating (and adding notifications in #41288)