fix(query-orchestrator): Use external_id for queue result retrieval t…

[ovr]

…o prevent no-cache query loops

No-cache queries could loop infinitely when multiple clients queried the same SQL near the long polling timeout edge. The root cause was QUEUE RESULT's mark-delete semantics — the first client to retry would consume the result, forcing others to re-execute the query.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.77%. Comparing base (c206026) to head (6142e24).

❗ There is a different number of reports uploaded between BASE (c206026) and HEAD (6142e24). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c206026)	HEAD (6142e24)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10538       +/-   ##
===========================================
- Coverage   83.41%   57.77%   -25.64%     
===========================================
  Files         250      223       -27     
  Lines       75150    17526    -57624     
  Branches        0     3607     +3607     
===========================================
- Hits        62683    10125    -52558     
+ Misses      12467     6859     -5608     
- Partials        0      542      +542     

Flag	Coverage Δ
cube-backend	57.77% <100.00%> (?)
cubesql	?

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