[Bug]: Angular always devMode enabled when using build-storybook

[ssams]

Describe the bug

Follow-Up for #16211 as requested in #16211 (comment), as it still applies in SB 7.

When using the angular.json "@storybook/angular:build-storybook" builder, prod mode is not used like I would expect.

To Reproduce

Reproducible with unmodified sandbox project.

1. npx storybook@next sandbox angular-cli/default-ts
2. sandbox created with defaults, switch to the new project and run yarn install
3. yarn build-storybook
4. Open the project in a browser.
5. Navigate to the stories of an Angular component.
6. Check the browser console output.

Browser console logs an information that it's running in development mode: "Angular is running in development mode. Call enableProdMode() to enable production mode."

System

Environment Info:

  System:
    OS: Linux 6.3 Fedora Linux 38 (Workstation Edition)
    CPU: (16) x64 AMD Ryzen 7 5700G with Radeon Graphics
  Binaries:
    Node: 18.16.0 - /usr/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 9.5.1 - /usr/bin/npm
  Browsers:
    Chrome: 114.0.5735.133
  npmPackages:
    @storybook/addon-docs: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/addon-essentials: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/addon-interactions: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/addon-links: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/angular: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/blocks: ^7.1.0-alpha.42 => 7.1.0-alpha.42 
    @storybook/testing-library: ^0.2.0 => 0.2.0

Additional context

Workaround from #16211 (comment) still works.