lint: enable nolintlinter, disable on tests

## Description
- enable nolintlint
- disable linting on tests

Closes: #XXX

crypto/ed25519/ed25519.go

@@ -160,7 +160,6 @@ func (pubKey PubKeyEd25519) String() string {
 	return fmt.Sprintf("PubKeyEd25519{%X}", pubKey[:])
 }
 
-// nolint: golint
 func (pubKey PubKeyEd25519) Equals(other crypto.PubKey) bool {
 	if otherEd, ok := other.(PubKeyEd25519); ok {
 		return bytes.Equal(pubKey[:], otherEd[:])

crypto/merkle/result.go

@@ -1,4 +1,3 @@
-// nolint: dupl
 package merkle
 
 import (

crypto/xchacha20poly1305/xchachapoly.go

@@ -47,12 +47,10 @@ func New(key []byte) (cipher.AEAD, error) {
 	return ret, nil
 }
 
-// nolint
 func (c *xchacha20poly1305) NonceSize() int {
 	return NonceSize
 }
 
-// nolint
 func (c *xchacha20poly1305) Overhead() int {
 	return TagSize
 }