[angular/angular-cli] fix(@schematics/angular): add missing prettier config (PR #30590)

DRANK

The current style guide no longer enforces the use of the template file extension `.component.html`. This means that prettier won't auto-detect the proper parser for these files anymore. To ensure template formatting works out-of-the-box, we're adding a prettier config to newly created projects. Fixes https://github.com/angular/angular-cli/issues/30548