Move new mesher benchmark to test_benchmarks.py

[jdegenstein]

Per the recent PR #868 we have already observed a test failure on CI since the free github runners can be pretty slow. I decided to move a simplified version of this test to the tests/test_benchmarks.py file and importantly I eliminated the performance assertion. Instead the benchmarks workflow will print the benchmark results to stdout during CI.

CC: @drbh

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.36%. Comparing base (9e6bc2d) to head (09e99b1).
Report is 15 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #870      +/-   ##
==========================================
- Coverage   96.40%   96.36%   -0.05%     
==========================================
  Files          31       31              
  Lines        9112     9121       +9     
==========================================
+ Hits         8784     8789       +5     
- Misses        328      332       +4     

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