Remove webpack-internal console error messages for feature specs

What does this MR do and why?

Exempt webpack-internal console messages from raising a JSConsoleError during feature specs.

Whenever a feature spec fails, a webpack-internal JS console message is raised as an additional failure.

This MR hides webpack-internal messages from the failure output.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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