fix(NcPasswordField): respect checkPasswordStrength for input validation

[Antreesy]

☑️ Resolves

• Ref fix: Don't apply password policy when trying to confirm a password nextcloud-password-confirmation#1228 (comment)
• Also set minLength to undefined, if not set

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🚧 Tasks

• Test

🏁 Checklist

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.46%. Comparing base (317b375) to head (084937e).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7845      +/-   ##
==========================================
+ Coverage   51.41%   51.46%   +0.04%     
==========================================
  Files          96       96              
  Lines        3147     3150       +3     
  Branches      868      869       +1     
==========================================
+ Hits         1618     1621       +3     
  Misses       1279     1279              
  Partials      250      250              

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[susnux]

makes sense!

[ShGKme]

/backport to stable8