all: enable and resolve uncheckedInlineErr, preferStringWriter, preferFprint, and deprecatedComment linter checks

[Sahil-4555]

Enables four gocritic linter rules (uncheckedInlineErr, preferStringWriter, preferFprint, and deprecatedComment) in .golangci.yml and resolves all code violations across the repository.

1. uncheckedInlineErr

   • Rule: Flags inlined error initializations where the error variable is not cleanly evaluated in the condition.
   • Changes: Un-inlined error assignment err := utils.SetNodeConfig(...) prior to if err != nil check in cmd/erigon/node/node.go.

2. preferStringWriter

   • Rule: Prefers w.WriteString(s) over w.Write([]byte(s)) to avoid unnecessary string-to-byte allocations on writers implementing io.StringWriter.
   • Changes: Refactored Write([]byte(...)) calls to WriteString(...) in cmd/rpctest/rpctest/utils.go and db/state/commitment_convert.go.

3. preferFprint

   • Rule: Prefers fmt.Fprintf(w, ...) over w.WriteString(fmt.Sprintf(...)) for cleaner syntax and reduced allocations.
   • Changes: Refactored string formatting calls to fmt.Fprintf across cmd/capcli/cli.go and execution/commitment/hex_patricia_hashed.go.

4. deprecatedComment

   • Rule: Enforces standard Go formatting for Deprecated: notices by placing them in a dedicated paragraph so IDEs and Go tooling correctly parse deprecation hints.
   • Changes: Added blank comment lines before Deprecated: notices across:
     • cl/cltypes/solid/hashutil.go
     • node/cli/flags.go
     • p2p/enode/node.go
     • rpc/jsonrpc/eth_deprecated.go
     • rpc/subscription.go

[erigon-copilot]

[SharovBot] 🤖 Closed by automated review.

This PR appears to be an AI-generated stylistic/convention change (linter compliance: preferFprint, preferStringWriter, deprecatedComment fixups) from a non-core contributor.

These types of changes are not being accepted at this time. The changes will be included in a consolidated weekly cleanup PR. If you believe this was closed in error, please reach out to a maintainer.