all: enable makezero errchkjson noctx linters - #23174

Enables 3 bug-catching linter rules in .golangci.yml (makezero, errchkjson, and noctx) and resolves all existing violations across the codebase to ensure continuous CI protection against subtle runtime bugs.

1. makezero

• What it prevents: Prevents silent slice corruption where make([]T, n) is followed by append(), which unintentionally prepends n zero-value items at the beginning of a slice.
• Benefits: Guarantees slice allocations in Erigon are safe and clean, ensuring new code additions cannot introduce zero-padded array bugs into memory or state processing logic.

2. errchkjson

• What it prevents: Prevents unhandled JSON serialization failures from json.Marshal, json.MarshalIndent, or json.Encoder.Encode failing silently when structs contain unsupported types, custom marshalers, or map keys.
• Benefits: Improves API reliability and logging accuracy by ensuring JSON encoding errors in RPC, REST endpoints, and tools are caught and logged rather than producing corrupt/empty payloads.

3. noctx

• What it prevents: Prevents network request hangs and uncancelable HTTP/socket operations created with http.NewRequest instead of context-aware functions.
• Benefits: Ensures HTTP requests respect parent context timeouts and cancellation signals, preventing leaking goroutines and stuck network calls under heavy load or shutdown.