Alan Agius 424af28602 fix(@angular-devkit/build-angular): add validation to fileReplacement values
fileReplacement is meant to replace compilation source files (JavaScript or TypeScript) with other compilation source files in the build. With this change we add validation to fail the build when the files have unsupported extensions.

Closes #11451
2020-11-06 21:16:38 +01:00
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