Description fields can pass validation with only whitespaces

[jdaigneau5]

Summary

In the 5.0 schema, descriptions fields for cna.container, problemTypes, and rejectedReasons have a minimum length of 1. However, whitespaces fulfill this requirement, allowing descriptions to effectively be blank and validate successfully. This should be changed at the schema level, but in the meantime can be hot fixed in Cve-services.

Definition of Done

• Create new validator to check description fields for at least one, non whitespace character
• Apply validator to cna.container.descriptions , cna.container.problemTypes, cna.container.rejectReasons