fix(graph): Harden Graph calls

[sgrove]

Summary

Fixes some of the issues reported by @dannykingme where running netlify dev --graph would cause the CLI to die from time to time.

---

For us to review and ship your PR efficiently, please perform the following steps:

• Make sure the status checks below are successful ✅

[github-actions]

📊 Benchmark results

Comparing with a04bc10

Package size: 224 MB

⬆️ 0.01% increase vs. a04bc10

^  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB  224 MB 
│   ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐    ┌──┐  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
│   |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |  |    |▒▒|  
└───┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴──>
    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-30 (c6f3e85): 222 MB
• T-29 (d074933): 222 MB
• T-28 (9a88143): 222 MB
• T-27 (f024587): 221 MB
• T-26 (f5df499): 221 MB
• T-25 (ef07504): 221 MB
• T-24 (aa71c31): 221 MB
• T-23 (3eec8e7): 221 MB
• T-22 (198fad5): 221 MB
• T-21 (2260fff): 221 MB
• T-20 (1d63b08): 221 MB
• T-19 (7b89caf): 221 MB
• T-18 (7e0160a): 221 MB
• T-17 (875cdcc): 221 MB
• T-16 (00fcc1b): 221 MB
• T-15 (91ba4fe): 221 MB
• T-14 (9ab5603): 221 MB
• T-13 (e86b795): 221 MB
• T-12 (a684bc9): 224 MB
• T-11 (6ff4d8a): 224 MB
• T-10 (6f99bdc): 224 MB
• T-9 (90e8c3e): 224 MB
• T-8 (1f7fa51): 224 MB
• T-7 (cad6c60): 224 MB
• T-6 (5e23b25): 224 MB
• T-5 (d2e572a): 224 MB
• T-4 (2f11b27): 224 MB
• T-3 (6da32af): 224 MB
• T-2 (dad8d9a): 224 MB
• T-1 (a04bc10): 224 MB
• T (current commit): 224 MB