Network manager tests

[schaable]

The PR adds tests to the network manager, specifically for the config resolution phase and providers. It also fixes a bug in edrRpcDebugTraceToHardhat, where the output was mistakenly treated as a Buffer instead of a string (due to an incorrect type from EDR). Finally, it groups the ProviderErrors into a single file and normalizes their constructors.

Follow-up issues:

• Normalise JSON-RPC format for rpcDebugTrace edr#783
• Improve tests for validation errors in the network manager #6198

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 30, 2025 5:35pm

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[ChristopherDedominici]

I left a few minor comments but a part from that LGTM 😎