[BUG] Explicitly set IO config in unity catalog load table

[colin-ho]

Linters don't seem to catch unbound local variables if they are defined in multiple branches.

[codspeed-hq]

CodSpeed Performance Report

Merging #3453 will degrade performances by 16.4%

_{Comparing colin/bound-unity-ioconfig (be8ee0f) with main (c7f37e4)}

Summary

⚡ 2 improvements
❌ 1 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	colin/bound-unity-ioconfig	Change
❌	test_count[1 Small File]	3.5 ms	4.2 ms	-16.4%
⚡	test_iter_rows_first_row[100 Small Files]	406.1 ms	305.8 ms	+32.8%
⚡	test_show[100 Small Files]	25.8 ms	17.2 ms	+50%

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.49%. Comparing base (c7f37e4) to head (be8ee0f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
daft/unity_catalog/unity_catalog.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3453   +/-   ##
=======================================
  Coverage   77.49%   77.49%           
=======================================
  Files         687      687           
  Lines       84477    84483    +6     
=======================================
+ Hits        65464    65473    +9     
+ Misses      19013    19010    -3     

Files with missing lines	Coverage Δ
daft/unity_catalog/unity_catalog.py	10.29% <20.00%> (+0.91%)	⬆️

... and 4 files with indirect coverage changes