Add error message when computing consistency proof

[haydentherapper]

The service would panic if firstSize > lastSize because the error object was not created.

Summary

Release Note

Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 49.90%. Comparing base (488eb97) to head (f2dbac2).
Report is 239 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/api/tlog.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2278       +/-   ##
===========================================
- Coverage   66.46%   49.90%   -16.57%     
===========================================
  Files          92      192      +100     
  Lines        9258    24677    +15419     
===========================================
+ Hits         6153    12314     +6161     
- Misses       2359    11272     +8913     
- Partials      746     1091      +345     

Flag	Coverage Δ
e2etests	46.52% <0.00%> (-1.03%)	⬇️
unittests	41.91% <0.00%> (-5.77%)	⬇️

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