fix(server): Report original error message

[Borewit]

Display original error message of plugins like:

• karma-browserstack-launcher
• karma-cbt-launcher

Fixes #3414

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[trusktr]

@johnjbarton @Borewit Are these changes by chanced related to #543 and #1268 in any way?

[trusktr]

In particular, regarding those two issues, see my comment at the bottom: #543 (comment)

[Borewit]

Are these changes by chanced related to #543 and #1268 in any way?

I don't think it is the exact same issue.

In this case a message UnhandledRejection was printed to the console, without providing (printing) any further detail.

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🎉 This PR is included in version 5.0.0 🎉

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