fix errcheck issue (#28548)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -76,7 +76,6 @@ issues:
         channels/api4/data_retention.go|\
         channels/api4/export_test.go|\
         channels/api4/file_test.go|\
-        channels/api4/import_test.go|\
         channels/api4/ip_filtering_test.go|\
         channels/api4/job_test.go|\
         channels/api4/license.go|\