Spechelper Test Server Error Handling Improvements

[teallarson]

Change description

Found when pairing with @evantahler: When starting a server in detached mode (how front end tests are run), server errors did not previously surface.

Now, these errors are surfaced and will show up in the jest error reporting when the server cannot start.

Checklists

Development

• Application changes have been tested appropriately

Impact

• Code follows company security practices and guidelines
• Security impact of change has been considered
• Performance impact of change has been considered
• Possible migration needs considered (model migrations, config migrations, etc.)

Please explain any security, performance, migration, or other impacts if relevant:

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached where applicable.
• Relevant tags have been added to the PR (bug, enhancement, internal, etc.)

[evantahler]

Looks great, except for my old mistakes in that method...

[edmundito]

👍🏼