Update test data

[hkjeldsberg]

• Reduce size of test data for improved test run time
• Total run time of all tests improved from >80s to ~15seconds (run locally)

[codecov-commenter]

Codecov Report

Merging #109 (fe78078) into master (0b034d0) will increase coverage by 95.67%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #109       +/-   ##
===========================================
+ Coverage        0   95.67%   +95.67%     
===========================================
  Files           0        5        +5     
  Lines           0      185      +185     
===========================================
+ Hits            0      177      +177     
- Misses          0        8        +8     

Impacted Files	Coverage Δ
tests/test_compute_flow_and_simulation_metrics.py	96.29% <100.00%> (ø)
tests/test_compute_hemodynamc_indices.py	96.07% <100.00%> (ø)

... and 3 files with indirect coverage changes

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