Generating a new project on Node 14 with ember-cli 4.12 with yarn and typescript fails

[kategengler]

CI failed on the lts-4-12 branch https://github.com/ember-cli/ember-cli/actions/runs/5406981956/jobs/9824464495

This exposed that generating a new project with yarn and typescript on Node 14 currently fails, due to dependencies of packages installed by ember-cli-typescript having engines.

Workarounds:

• Use a newer node version
• When generating the project errors, cd into the generated project and run the yarn add command that errored (should be printed to console), but with --ignore-engines. Any yarn command you run going forward will need --ignore-engines)
• Find the correct older versions of the @types/ember* packages to install that do not depend on the newer version of @ember/test-helpers that has the engines updated.

[locks]

Node 14 is EOL since May, can we assume people will be or will move to 16? 😅

[ef4]

I think it's worth skipping these tests on that version.