Update GPCCA::tsi

[WeilerP]

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Description

• Refactors the tsi method, to set the number of macrostates even if the computation failed.

Closes

Closes #1258.

[codecov]

Codecov Report

Attention: Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.

Project coverage is 79.38%. Comparing base (75c6c95) to head (27f4506).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cellrank/estimators/terminal_states/_gpcca.py	57.89%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1259      +/-   ##
==========================================
- Coverage   79.43%   79.38%   -0.06%     
==========================================
  Files          51       51              
  Lines        8603     8618      +15     
  Branches     1489     1491       +2     
==========================================
+ Hits         6834     6841       +7     
- Misses       1195     1201       +6     
- Partials      574      576       +2     

Files with missing lines	Coverage Δ
src/cellrank/estimators/terminal_states/_gpcca.py	78.04% <57.89%> (-0.79%)	⬇️

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