fix: Re-use external connection for CubeStore in queue

[ovr]

Hello!

refs #5042

Thanks

[codecov]

Codecov Report

Base: 41.31% // Head: 41.31% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (6367104) compared to base (0f4a431).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6028      +/-   ##
==========================================
- Coverage   41.31%   41.31%   -0.01%     
==========================================
  Files         151      151              
  Lines       20037    20039       +2     
  Branches     5214     5214              
==========================================
  Hits         8279     8279              
- Misses      10919    10920       +1     
- Partials      839      840       +1     

Flag	Coverage Δ
cube-backend	41.31% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...y-orchestrator/src/orchestrator/PreAggregations.ts	78.63% <ø> (ø)
...-query-orchestrator/src/orchestrator/QueryCache.ts	66.33% <0.00%> (-0.22%)	⬇️
...orchestrator/src/orchestrator/QueryOrchestrator.ts	55.00% <ø> (ø)
...-query-orchestrator/src/orchestrator/QueryQueue.js	62.53% <0.00%> (-0.19%)	⬇️

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