Explicitly prefix Node version with "Node" in testing jobs

[sodic]

Description

Replace this message here, and write a high-level overview with any additional
context (motivation, trade-offs, approaches considered, concerns, ...).

Type of change

• 🔧 Just code/docs improvement
• 🐞 Bug fix
• 🚀 New/improved feature
• 💥 Breaking change

Checklist

• I tested my change in a Wasp app to verify that it works as intended.

• 🧪 Tests and apps:

  • I added unit tests for my change.
  • (if you fixed a bug) I added a regression test for the bug I fixed.
  • (if you added/updated a feature) I added/updated e2e tests in examples/kitchen-sink/e2e-tests.
  • (if you added/updated a feature) I updated the starter templates in waspc/data/Cli/templates, as needed.
  • (if you added/updated a feature) I updated the example apps in examples/, as needed.
    • (if you updated examples/tutorials) I updated the tutorial in the docs (and vice versa).

• 📜 Documentation:

  • (if you added/updated a feature) I added/updated the documentation in web/docs/.

• 🆕 Changelog: (if change is more than just code/docs improvement)

  • I updated waspc/ChangeLog.md with a user-friendly description of the change.
  • (if you did a breaking change) I added a step to the current migration guide in web/docs/migration-guides/.
  • I bumped the version in waspc/waspc.cabal to reflect the changes I introduced.