chore(ci): Increase test timeout to 30m (~2x median)

[effigies]

Hitting 20m timeout. Most runs finish in the 16-17m range, so 30m is a safer indicator that something is actually wrong.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.19%. Comparing base (1f16768) to head (bcbaa19).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #469       +/-   ##
===========================================
+ Coverage   63.23%   74.19%   +10.96%     
===========================================
  Files          25       25               
  Lines        1961     1957        -4     
  Branches      246      245        -1     
===========================================
+ Hits         1240     1452      +212     
+ Misses        683      438      -245     
- Partials       38       67       +29     

Flag	Coverage Δ
ds054	45.59% <ø> (?)

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