CP-864 Explicitly exit process when dart_dev has finished

[evanweible-wf]

Issue

When a project has a custom tool/dev.dart configuration, dart_dev has to spawn a process to take advantage of that. Dart_dev then waits for that process to complete before exiting the main process. It's possible that this sub process may fail to complete, even if the dart_dev task has completed successfully.

Changes

Source:

• The dev() file that acts as the entry point for the executable (either through the default usage or through the sub-process scenario that runs a project's tool/dev.dart file) now explicitly exits the process to force completion of the parent task.

Tests:

• n/a

Areas of Regression

• n/a

Testing

• CI build passes.

Code Review

@trentgrover-wf
@maxwellpeterson-wf
@dustinlessard-wf
@jayudey-wf

[trentgrover-wf]

+1

[codecov-io]

Current coverage is 52.11%

Merging #46 into master will not affect coverage as of d2690df

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[maxwellpeterson-wf]

+1
@jayudey-wf ready for merge

[jayudey-wf]

QA Resource Approval: +10

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • CI passes running dart_dev tasks
• Unit test created/updated
• All unit tests pass

Merging into master.