fix(api-gateway): Returns null for all measures except the last one (…

[ovr]

…#10482)

It's a regression introduced in #10428
I've renamed res to accum to protect possible errors with shadow variables, and I miss 1 place :(

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.63%. Comparing base (6a68718) to head (3b5b382).
⚠️ Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (6a68718) and HEAD (3b5b382). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6a68718)	HEAD (3b5b382)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10495       +/-   ##
===========================================
- Coverage   78.53%   57.63%   -20.90%     
===========================================
  Files         473      223      -250     
  Lines       92620    17508    -75112     
  Branches     3598     3598               
===========================================
- Hits        72736    10091    -62645     
+ Misses      19343     6876    -12467     
  Partials      541      541               

Flag	Coverage Δ
cube-backend	57.63% <ø> (+<0.01%)	⬆️
cubesql	?

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