Fixes issue causing `HtmlReportWriter` to ignore configured project.buildDir.

[rharter]

We use a customized project.buildDir in our project, and while the plugin reads it appropriately to be able to print a string to the console, it didn't pass it to the HtmlReportWriter.

[rharter]

Error appears to be a transient network error. Mind poking it again?

[rharter]

I've moved the setting to the environment resources, and added tests on both sides.

Running the plugin tests locally appears to be a little flaky, getting inconsistent failures in flagDebugLinkedObjectsIsOn and cacheable. I'm not sure if that was the case before, but I can't reliably reproduce the failures and don't expect that my code would have any effect there. That being said, let me know if there's something I'm missing.

[chrisbanes]

Any movement on this? Looks like CI needs to be kicked off

[rharter]

Just wanted to bump this. I see there are conflicts due to the project restructure, but I've also got other open PRs that haven't moved and would rather not spend my time updating this one if there isn't a chance of action on it.