Link to troubleshooting docs when src campaign apply|preview fails #451
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This fixes https://github.com/sourcegraph/sourcegraph/issues/17259, but
contrary to what I stated in the original ticket, I think it makes more
sense to always link to these docs.
Why?
when not. Especially since running the steps could result in an error
that could be fixed through the troubleshooting guide (example:
broken docker setup).
Screenshots