feat(@angular-devkit/build-angular): expose webpack-dev-server's allowedHosts option - #15366

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Thank you for the contribution.

The test is fine for now. They could indeed use a refactor to combine similar items but that is outside the scope for this.

Can you rebase? Some changes to the CI checks were recently done.

Could you also add a Closes #13656 to the message?

I have rebased and amended the commit message. Several tests in test-large fail, but I get the exact same results when running the test-large set on master, so it seems unrelated to the change.

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