SCIX-775 fix: use OR operator for multiple collections in classic form

[thostetler]

When selecting multiple collections in the classic form (e.g., Astronomy
and Physics), the query was incorrectly joining them with spaces instead
of OR operators, producing collection:(astronomy physics) instead of
the correct collection:(astronomy OR physics).

• Changed logicJoin('and') to logicJoin('or') in getLimit()
• Updated test expectations to match correct OR-joined output

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.8%. Comparing base (9678f94) to head (e1cf29c).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #764     +/-   ##
========================================
- Coverage    71.8%   71.8%   -0.0%     
========================================
  Files         217     217             
  Lines       24485   24485             
  Branches     1402    1402             
========================================
- Hits        17575   17574      -1     
- Misses       6878    6879      +1     
  Partials       32      32             

Files with missing lines	Coverage Δ
src/components/ClassicForm/helpers.ts	98.3% <100.0%> (ø)

... and 1 file with indirect coverage changes

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