test(NcDateTimePicker): shrink number of locales for the snapshot test case

[odzhychko]

Now only locales supported by date-fns are included.

Previously we also included locales that where supported by Intl.DateTime.

☑️ Resolves

• fix(NcDateTimePicker): handle text input for default formatting #8657 (review)

🏁 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 53.28%. Comparing base (5f6ae35) to head (dc660e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8825   +/-   ##
=======================================
  Coverage   53.28%   53.28%           
=======================================
  Files         109      109           
  Lines        3699     3699           
  Branches     1083     1083           
=======================================
  Hits         1971     1971           
  Misses       1473     1473           
  Partials      255      255           

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