fix: gracefully handle errors when setting headers

[eduardoboucas]

Summary

When we finish processing a serverless function and transfer any header it sets into the final response, we're doing a setHeader call that may throw. When that happens, the entire app crashes.

This PR addresses that by gracefully handling the error, showing a log in the terminal and displaying the function error page.

[github-actions]

📊 Benchmark results

Comparing with 2aa9341

Package size: 267 MB

⬇️ 0.00% decrease vs. 2aa9341

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└───┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴──>
    T-12    T-11    T-10    T-9     T-8     T-7     T-6     T-5     T-4     T-3     T-2     T-1      T    

Legend

• T-12 (bce1f2c): 260 MB
• T-11 (2d3923c): 260 MB
• T-10 (6726bf4): 267 MB
• T-9 (87adddc): 267 MB
• T-8 (6d6531a): 267 MB
• T-7 (f33c595): 267 MB
• T-6 (6594da7): 267 MB
• T-5 (22ecec6): 260 MB
• T-4 (c7c5fff): 267 MB
• T-3 (7e27e7a): 267 MB
• T-2 (89754a1): 267 MB
• T-1 (2aa9341): 267 MB
• T (current commit): 267 MB

[khendrikse]

Very stylish and graceful 💅