rpc/jsonrpc/server: return an error in WriteRPCResponseHTTP(Error) (bp #6204) (#6230)

* rpc/jsonrpc/server: return an error in WriteRPCResponseHTTP(Error) (#6204)

instead of panicking
Closes #5529

(cherry picked from commit 00b9524168)

# Conflicts:
#	CHANGELOG_PENDING.md
#	rpc/jsonrpc/server/http_json_handler.go
#	rpc/jsonrpc/server/http_server.go
#	rpc/jsonrpc/server/http_server_test.go
#	rpc/jsonrpc/server/http_uri_handler.go

* resolve conflicts

* fix linting

* fix conflict

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Co-authored-by: Marko Baricevic <marbar3778@yahoo.com>

crypto/hash.go

@@ -6,6 +6,6 @@ import (
 
 func Sha256(bytes []byte) []byte {
 	hasher := sha256.New()
-	hasher.Write(bytes) //nolint:errcheck // ignore error
+	hasher.Write(bytes)
 	return hasher.Sum(nil)
 }

crypto/merkle/proof_value.go

@@ -80,13 +80,13 @@ func (op ValueOp) Run(args [][]byte) ([][]byte, error) {
 	}
 	value := args[0]
 	hasher := tmhash.New()
-	hasher.Write(value) //nolint: errcheck // does not error
+	hasher.Write(value)
 	vhash := hasher.Sum(nil)
 
 	bz := new(bytes.Buffer)
 	// Wrap <op.Key, vhash> to hash the KVPair.
-	encodeByteSlice(bz, op.key) //nolint: errcheck // does not error
-	encodeByteSlice(bz, vhash)  //nolint: errcheck // does not error
+	encodeByteSlice(bz, op.key) // nolint: errcheck // does not error
+	encodeByteSlice(bz, vhash)  // nolint: errcheck // does not error
 	kvhash := leafHash(bz.Bytes())
 
 	if !bytes.Equal(kvhash, op.Proof.LeafHash) {