fix(Length): pick the violated bound when each: true

[official-burak]

Thanks for the clear repro in #2692. With each: true, Length's default message was looking at the array size, so one too-long tag could be reported as too short.

I switched that choice to a failing item's character length, and added tests for both a too-long item and several too-short ones.

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

Fixes

fixes #2692