Finalize callbacks for custom time integrators

[JoshuaLampert]

As noted by @knstmrd, after having merged #2275, the summary callback is not printed anymore for our custom integrators after the simulation finished. This is because we do not call the callback finalizers in our custom solve function. This PR fixes this.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.90%. Comparing base (95ba917) to head (57a8f0c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/time_integration/time_integration.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2304      +/-   ##
==========================================
- Coverage   96.90%   96.90%   -0.00%     
==========================================
  Files         493      493              
  Lines       40331    40342      +11     
==========================================
+ Hits        39082    39092      +10     
- Misses       1249     1250       +1     

Flag	Coverage Δ
unittests	96.90% <90.91%> (-<0.01%)	⬇️

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[bennibolm]

Thanks for fixing this.

[ranocha]

Thanks!