* Add missing URL length validation in LinkMetadata * Added MaxURLLength constant * Add test to validate new URL length limit * Add comment about table constraint * Use a seperate error string for URL length errors * Added error string fpr URL length * Updated error message * Update en.json * Fixed gofmt error in link_metadata.go * use right txn id ```release-note NONE ``` --------- Co-authored-by: Agniva De Sarker <agnivade@yahoo.co.in> Co-authored-by: Mattermost Build <build@mattermost.com>