Convert cjs blueprint index.js files to 'cjs masquerading as esm' (in…

[NullVoxPopuli]

…tentionally) to take advantage of node's compatibility features to progress towards adding type=module on this package's package.json (which would make all these blueprint files real esm, not cjs pretending to esm)

Requires:

• upgrade ember-cli #21423
  • but that, in turn, requires: Upgrade testem to latest #21425
  • this means that ember-source requires ember-cli 7+, and the blueprints provided by ember-source will no longer be compatible with ember-cli < 7 -- I think this is ok, because we don't really formally support mismatched ember-cli/ember-source majors, since we do lockstep and, we also require node's require(esm), so... we can do some nice things with that assumption

[github-actions]

📊 Size report

Tarball size — 1.2 MB → 1.2 MB

dist/dev   No changes

File	Before (Size / Brotli)	After (Size / Brotli)
./packages/shared-chunks/template-{hash}.js	1.1 kB / 401 B	-54%↓491 B / -49.4%↓203 B
Total (Includes all files)	2 MB / 479.3 kB	2 MB / 479.3 kB

---

dist/prod   No changes

File	Before (Size / Brotli)	After (Size / Brotli)
./packages/shared-chunks/api-{hash}.js	8.3 kB / 1.8 kB	-28.6%↓5.9 kB / -17.3%↓1.5 kB
Total (Includes all files)	1.8 MB / 437.2 kB	1.8 MB / 437.2 kB

---

smoke-tests/v2-app-hello-world-template/dist   No changes

File	Before (Size / Brotli)	After (Size / Brotli)
Total (Includes all files)	235 kB / 64.4 kB	235 kB / 64.4 kB

_{🤖 This report was automatically generated by wyvox/pkg-size}