fix(@angular-devkit/build-angular): shim node events builtin for dev server #13725
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The dev server requires a node 'events' builtin shim to function. The dev server as written only currently works with package managers that hoist the
events
shim package to an accessible location. Hoisting is unfortunately not standardized and the assumption within the dev server will not hold true for all package managers. The actual code is only accessed when hmr is enabled which allows the 'events' import to be ignored in the non-hmr case.Closes #13680