fix: Simplify external refresh condition so when pre-aggregation buil…

[paveltiunov]

…der is set so it's never an external refresh instance

Check List

• Tests have been run in packages where changes have been made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.13%. Comparing base (e9dce76) to head (0dea2a3).
⚠️ Report is 3 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (e9dce76) and HEAD (0dea2a3). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e9dce76)	HEAD (0dea2a3)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10116       +/-   ##
===========================================
- Coverage   83.33%   55.13%   -28.20%     
===========================================
  Files         244      213       -31     
  Lines       74112    16885    -57227     
  Branches        0     3330     +3330     
===========================================
- Hits        61763     9310    -52453     
+ Misses      12349     7099     -5250     
- Partials        0      476      +476     

Flag	Coverage Δ
cube-backend	55.13% <ø> (?)
cubesql	?

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