remove label_dest in contract

[ogauthe]

As we discussed last week, there is a difficulty in contract to deal with both a given destination and a permutation for this destination. We settled on removing the label_dest argument such that the output is always returned without additional permutation. This PR removes label_dest everywhere in contract.

Locally my tests fail in test_matrixalgebra.jl for Truncation on ComplexFloat32. I did not change that part so I do not understand what is happening.
EDIT: CI is fine, so it must be my local config.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.04%. Comparing base (bd74481) to head (356deff).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/contract/blockedperms.jl	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   94.90%   95.04%   +0.14%     
==========================================
  Files          14       14              
  Lines         451      444       -7     
==========================================
- Hits          428      422       -6     
+ Misses         23       22       -1     

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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[ogauthe]

replaced by #75