Limit and warn when work item title hits max length

Summary

We currently limit titles to 255 characters. In the legacy issue experience we capped the length at that limit. In the work item experience we allow unlimited entry then show an error. Neither fully communicates the state effectively.

Proposal

1. When the character count is >= 230, show a character counter ("25 characters remaining.")
2. When character count is > 255, the character counter should be red ("23 characters over limit.")