fix(NcFormBox): use `text-wrap: pretty` in items

[ShGKme]

☑️ Resolves

• Fix https://github.com/nextcloud-libraries/nextcloud-vue/issues/7842
• Thanks @kra-mo for a performance-related research
• Keeping it as draft until know if other form items should have it as well

🏁 Checklist

• [ ] ⛑️ Tests are included or are not applicable
• [x] 📘 Component documentation has been extended, updated or is not applicable
• [x] 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[ShGKme]

/backport to stable8

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 51.75%. Comparing base (eac1b94) to head (8ba3974).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7855   +/-   ##
=======================================
  Coverage   51.75%   51.75%           
=======================================
  Files          98       98           
  Lines        3169     3169           
  Branches      871      871           
=======================================
  Hits         1640     1640           
  Misses       1279     1279           
  Partials      250      250           

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