8 migration does not remove commented polyfills

[filipesilva]

CLI 7 projects have almost all polyfills commented out except zone.js.

The CLI 8 migration attempts to remove polyfills imports by parsing the AST, but since they are commented out they never show up.

The migration should remove these imports regardless of being commented out, since they aren't necessary anymore.

[filipesilva]

This should be ok now. We also check for known hashes of unmodified polyfills file, for both Linux and Windows, and replace those. That should cover most of the comment cases.

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