Since v15, prod mode is handled by the CLI with the `optimization` flag. We can remove the environement files and `enableProdMode` when the tests use the CLI.
PR Close#49746
Prior to this, the `@angular/localize/init` was added as a polyfill which caused the `@angular/localize` types not to be included in the TypeScript program which caused errors such as the below:
```
Error: src/app/app.component.ts:9:11 - error TS2304: Cannot find name '$localize'.
```
With the recent changes in the CLI (https://github.com/angular/angular-cli/pull/24032), adding `@angular/localize/init` as polyfil or in the `main.server.ts` is no longer necessary. Instead we add this as a TypeScript type. When users are running in JIT mode, we add `@angular/localize/init` as an additional entrypoint.
This change also exposes the `$localize` method as a global when importing `@angular/localize`.
Closes#47677
PR Close#47763
Sets up a minimal CLI project for testing that `ng add @angular/localize`
works as expected. Schematic sub-packages are prone to CJS/ESM issues
due the overall framework packages being denoted as strict ESM.
This may not be an issue in the concrete scenario of `@angular/localize`
right now, but it is still good to have an integration test similar to
the tests we have for `@angular/core` schematics.
PR Close#44016
