Improve Helix Error Reporting

[nagilson]

Motivators

When helix fails, there are several core problems that make the build analysis tab no longer helpful.

1. Failures do not appear, and instead this error is displayed from dotnet-helix-service: This is a helix work item crash with status: BadExit.

2. Work Item failures simply say Test has failed. Check the log: log_link when they could actually provide the error, so we don't have to click and read the log.

3. When I click the link on '[Console]' it takes me here: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1310620&view=ms.vss-test-web.build-test-results-tab&runId=36607218&resultId=113379&paneView=debug

This view is not helpful - here is what it shows me. "The Helix Work Item failed. Often this is due to a test crash. Please see the 'Artifacts' tab above for additional logs." The failures for a "Work Item" are not helpful and provide nothing actionable. What I really want to see is a specific test failure link for that build, https://dev.azure.com/dnceng-public/public/_build/results?buildId=1310620&view=ms.vss-test-web.build-test-results-tab&runId=36607090&resultId=100720&paneView=debug such as this link, which shows ''Expected string to be or empty because Expected command to not output to stderr but it was not:'

Fixes

Adds more error details from the log into the output messages. Note, I have not worked in the Arcade repo so I'm not familiar with this logic. It may also be controversial to create a longer string in the output by showing more error details.

My goal is to speed up diagnostic time and reduce the number of clicks it takes to see what failed in a PR.

To double check:

• The right tests are in and the right validation has happened. Guidance: https://github.com/dotnet/arcade/blob/main/Documentation/Validation.md