[testlib] Use the builtin validation option of OSU benchmarks to validate the results

[vkarak]

Replaces #2645.

[codecov-commenter]

Codecov Report

Base: 86.26% // Head: 86.33% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (7f237b9) compared to base (e90be6d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2679      +/-   ##
==========================================
+ Coverage   86.26%   86.33%   +0.06%     
==========================================
  Files          60       60              
  Lines       10990    11135     +145     
==========================================
+ Hits         9481     9613     +132     
- Misses       1509     1522      +13     

Impacted Files	Coverage Δ
reframe/core/launchers/mpi.py	93.69% <0.00%> (-5.21%)	⬇️
reframe/core/environments.py	95.27% <0.00%> (-1.13%)	⬇️
reframe/frontend/runreport.py	94.61% <0.00%> (-0.70%)	⬇️
reframe/core/variables.py	95.75% <0.00%> (-0.56%)	⬇️
reframe/frontend/cli.py	72.30% <0.00%> (-0.12%)	⬇️
reframe/core/meta.py	99.08% <0.00%> (ø)
reframe/core/runtime.py	92.96% <0.00%> (ø)
reframe/core/systems.py	89.95% <0.00%> (ø)
reframe/core/pipeline.py	93.41% <0.00%> (+<0.01%)	⬆️
reframe/frontend/statistics.py	96.06% <0.00%> (+0.06%)	⬆️
... and 5 more

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