Alan Agius 715a7a5570 fix(@angular-devkit/build-angular): allow json files in fileReplacement
JSON files a can also be valid fileReplacement when using the `resolveJsonModule` TypeScript feature. This causes JSON files to be resolved as JS modules and hence be part of the TypeScript program.

Closes #19378
2020-11-13 15:53:14 -05:00
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