ci: enable the nolintlint linter (#5221)

This linter helps us find unneeded nolint statements.

integrationtests/self/handshake_context_test.go

@@ -229,7 +229,7 @@ func TestContextOnClientSide(t *testing.T) {
 		return &tlsServerConf.Certificates[0], nil
 	}
 
-	ctx, cancel := context.WithCancel(context.WithValue(context.Background(), "foo", "bar")) //nolint:staticcheck
+	ctx, cancel := context.WithCancel(context.WithValue(context.Background(), "foo", "bar"))
 	conn, err := quic.Dial(
 		ctx,
 		newUDPConnLocalhost(t),

integrationtests/self/http_test.go

@@ -675,7 +675,7 @@ func TestHTTPConnContext(t *testing.T) {
 		func(s *http3.Server) {
 			s.ConnContext = func(ctx context.Context, c *quic.Conn) context.Context {
 				connCtxChan <- ctx
-				ctx = context.WithValue(ctx, "foo", "bar") //nolint:staticcheck
+				ctx = context.WithValue(ctx, "foo", "bar")
 				return ctx
 			}
 		},