VAT API post DB overflow fix

It is possible for API posts to VAT to include a link value for a given finding that overflows the max size for the column this value is stored in, causing a 500 error. We can check the overall string length for a single finding, and if it would cause an error inserting into the DB, effectively truncate the value.

This error was noted in MM https://chat.il2.dso.mil/platform-one/pl/bu9tsrqcbjfmtbxye4tducyxew

CHT made and issue for this failure dsop/sentar/codevalor/restapi#3 (closed)