fix(@angular-devkit/build-angular): avoid build performance hit when using custom loader #27120
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loaders in esbuild aren't really custom code. You can only choose from the loaders that esbuild provides. So I doubt they require this
externalPackagesPlugin
which comes at a pretty steep cost of 1 second per 1500import
statements your project has on every build and watch rebuild.fixes #27116
followup to #26923
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