[INTERNAL] Output TypeScript apps and addons for StackBlitz

[NullVoxPopuli]

Prompted from https://twitter.com/ericsimons40/status/1629601959148748806

the JS template is already generated from this script and is viewable here:
https://stackblitz.com/github/ember-cli/editor-output/tree/stackblitz-app-output

Once this PR is merged, we will then have both:

• https://stackblitz.com/github/ember-cli/editor-output/tree/stackblitz-app-output
• https://stackblitz.com/github/ember-cli/editor-output/tree/stackblitz-app-output-typescript
• (and also the addon equivs (swap app for addon in the URL), but those don't exactly need to be on stackblitz front and center, imo)

Once this PR is merged (and I suppose another version of ember-cli released? (so that the dev script runs)),
@EricSimons has said that they'll get the two links (above, for JS and TS), added to the Stackblitz site so that Ember shows up here in the frontend category: https://stackblitz.com/?starters=frontend

[bertdeblock]

Seems okay to me. The use of the --typescript option will slow down the after:release script.
Ping @kellyselden to see if that's okay for you.

[kellyselden]

Seems good to me.

[bertdeblock]

Thank you @NullVoxPopuli.