fix(@angular-devkit/build-angular): exit dev-server when CTRL+C is pressed #23438
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Since version 4, webpack-dev-server by default will shutdown gracefully. This results in
CTRL+C
needed to be pressed multiple times to exit the process.See: https://github.com/webpack/webpack-dev-server/blob/c76b6d11a3821436c5e20207c8a38deb6ab7e33c/lib/Server.js#L1801-L1827
Closes #22216