fix(@ngtools/webpack): show a compilation error on invalid TypeScript version
fix(@ngtools/webpack): show a compilation error on invalid TypeScript version

A TypeScript version mismatch with the Angular compiler will no longer cause an
exception to propagate up through the Webpack system. In Node.js v14, this resulted
in an unhandled promise rejection warning and the build command never completing.
This can also be reproduced in newer versions of Node.js by using the Node.js
option `--unhandled-rejections=warn`. To correct this issue, the version mismatch
is now treated as a compilation error and added to the list of errors that are
displayed at the end of the build. This also has the benefit of avoiding the stack
trace of the exception from being shown which previously drew attention away from
the actual error message.

angular/angular-cli,clydin/angular-cli,angular/angular-cli,clydin/angular-cli,clydin/angular-cli,clydin/angular-cli,angular/angular-cli,angular/angular-cli