fix: expose env variables from config to edge functions

[eduardoboucas]

Summary

We currently have a bug where environment variables declared in netlify.toml are not exposed to edge functions.

To reproduce:

1. Write the following in netlify.toml

   [context.dev.environment]
   FOO = "bar"

2. Observe the log line:

   ◈ Injected netlify.toml file env var: FOO
   

3. Write an edge function that prints the value of the environment variable and observe it's empty

This PR fixes that.

[github-actions]

📊 Benchmark results

Comparing with 7e27e7a

Package size: 267 MB

⬇️ 0.00% decrease vs. 7e27e7a

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

Legend

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

[khendrikse]

Wh00p!

[codebyuma]

👋 Just noting this related issue: https://github.com/netlify/pod-compute/issues/301