chore(connect): consolidate multiple files in tests/connect

[universalmind303]

tiny PR to consolidate a bunch of files with a single test case into a file with multiple cases.

[codspeed-hq]

CodSpeed Performance Report

Merging #3676 will improve performances by 61.42%

_{Comparing universalmind303:connect-consolidation (564cae7) with main (c932ec9)}

Summary

⚡ 2 improvements
✅ 25 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	universalmind303:connect-consolidation	Change
⚡	test_iter_rows_first_row[100 Small Files]	276.8 ms	171.5 ms	+61.42%
⚡	test_show[100 Small Files]	24 ms	16.1 ms	+48.81%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.25%. Comparing base (c932ec9) to head (564cae7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3676      +/-   ##
==========================================
- Coverage   78.06%   77.25%   -0.82%     
==========================================
  Files         728      728              
  Lines       89967    92179    +2212     
==========================================
+ Hits        70236    71214     +978     
- Misses      19731    20965    +1234     

see 21 files with indirect coverage changes