[refactor] Clean-up tests from #2188

[yurishkuro]

Address remaining comments from #2188

[codecov]

Codecov Report

Merging #2200 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2200   +/-   ##
=======================================
  Coverage   96.17%   96.18%           
=======================================
  Files         219      219           
  Lines       10628    10632    +4     
=======================================
+ Hits        10222    10226    +4     
  Misses        351      351           
  Partials       55       55           

Impacted Files	Coverage Δ
...in/sampling/strategystore/static/strategy_store.go	100.00% <100.00%> (ø)
cmd/query/app/server.go	91.78% <0.00%> (-2.74%)	⬇️
cmd/query/app/static_handler.go	88.59% <0.00%> (+1.75%)	⬆️

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