fix(query-orchestrator): Return result when refreshKey changes during…

[ovr]

… query execution

When must-revalidate cache mode is used and the refreshKey changes faster than the query executes, queries could enter an endless loop. This fix:

1. Splits the cache renewal condition into "expired" vs "key mismatch but not expired" — user requests with a key mismatch on non-expired cache now return the cached result immediately with a background refresh instead of blocking.
2. Prevents pre-aggregation rebuilds when the existing build is recent (within refreshKeyRenewalThreshold) and the structure version hasn't changed.
3. Adds skipRefreshKeyWaitForRenew to the must-revalidate path to avoid blocking on refresh key re-evaluation.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.51%. Comparing base (c90b656) to head (e49cfa5).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...-query-orchestrator/src/orchestrator/QueryCache.ts	0.00%	11 Missing ⚠️
...hestrator/src/orchestrator/PreAggregationLoader.ts	0.00%	9 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c90b656) and HEAD (e49cfa5). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c90b656)	HEAD (e49cfa5)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10445       +/-   ##
===========================================
- Coverage   83.37%   57.51%   -25.86%     
===========================================
  Files         250      222       -28     
  Lines       74886    17399    -57487     
  Branches        0     3567     +3567     
===========================================
- Hits        62434    10007    -52427     
+ Misses      12452     6856     -5596     
- Partials        0      536      +536     

Flag	Coverage Δ
cube-backend	57.51% <0.00%> (?)
cubesql	?

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