fix(command-dev): fail when framework server exits early

[erezrokah]

Part of #1704

When the framework server (e.g. Gatsby) exits early we should treat it as an error, regardless of the sub process exit code.

For example the command echo hello have an exit code of 0, but netlify dev should consider it as a failure to launch.

There will be follow up PRs to refactor this code

[github-actions]

📊 Benchmark results

Comparing with 2b7fe5b

Package size: 330 MB

(no change)

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Legend

• T-29 (2b7fe5b): 330 MB
• T-28 (6770ab0): 330 MB
• T-27 (c1ba99b): 330 MB
• T-26 (f277378): 331 MB
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• T-22 (1a19fcd): 331 MB
• T-21 (f801d51): 331 MB
• T-20 (472d980): 331 MB
• T-19 (d1a201b): 331 MB
• T-18 (8152bb8): 331 MB
• T-17 (ec82ace): 331 MB
• T-16 (4d8c7e7): 331 MB
• T-15 (25a0b59): 331 MB
• T-14 (c3de183): 331 MB
• T-13 (c8ae08b): 331 MB
• T-12 (dd9bbf2): 331 MB
• T-11 (16ee6ec): 331 MB
• T-10 (4682123): 331 MB
• T-9 (5396527): 331 MB
• T-8 (768013b): 331 MB
• T-7 (8adc5f6): 331 MB
• T-6 (d627883): 331 MB
• T-5 (7d50260): 398 MB
• T-4 (24a5b5e): 398 MB
• T-3 (92a198f): 398 MB
• T-2 (388c551): 398 MB
• T-1 (ccff8c5): 398 MB
• T (current commit): 330 MB