Add mass over temperature ratio check output

[lisabiermann]

For each derived characteristic temperature, add one line of output to LoggingLevel::TransitionDetailed that informs the user about the thermal mass over temperature ratios at this temperature.

[codecov]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (0478ad4) to head (3ac2b2b).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/transition_tracer/transition_tracer.cpp	89.74%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #175      +/-   ##
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+ Coverage    82.73%   82.83%   +0.09%     
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  Files           54       54              
  Lines        19345    19384      +39     
  Branches      1847     1852       +5     
===========================================
+ Hits         16005    16056      +51     
+ Misses        3340     3328      -12     

Flag	Coverage Δ
unittests	82.83% <89.74%> (+0.09%)	⬆️

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[vollous]

Do you think we should also print the same ratios for the true vacuum? And should we save it in the output file or is just a print sufficient?

[lisabiermann]

Do you think we should also print the same ratios for the true vacuum? And should we save it in the output file or is just a print sufficient?

I'm not sure what this ratio would mean in the true vacuum. My understanding is that it is a measure of how good our high-temperature expansion should work, with the false vacuum as the initial position of the transition, that is why I check the false vacuum thermal masses.
For the moment, I would leave it as optional print statement. But I'm not against adding it as output in the future.