Closes: https://app.clickup.com/t/868hgq2tr

Description

• Bump golangci-lint from v2.1.6 to v2.11.4

Newly disabled linters

Linters introduced after v2.1.6 with medium & low priority are disabled to maintain parity and avoid a large diff in downstream repos.

• modernize: Suggests modern Go idioms — e.g., slices.Contains over manual loops, errors.As over type assertions, fmt.Appendf over fmt.Sprintf etc. 50+ issues across tx-chain
• noinlineerr: Warns against inlined error returns like return fmt.Errorf(...) - wants errors assigned to a named variable before returning. 632 issues, stylistic (no bug detection value)

Linters that were new but had low issue counts (embeddedstructfieldcheck, godoclint) are enabled - fixes applied in the tx-chain companion PR.

Go version

Not bumped. tx-chain uses Go 1.24.6 which is already above the minimum required by our current Cosmos SDK v0.53.6 (Go 1.23.2).
Go will be bumped alongside the Cosmos SDK v0.54 upgrade, which requires Go version 1.25.9.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

This change is