Introduce extension of scalars coercion of CombinatorialFreeModules

[mkoeppe]

📚 Description

Fixes #21405

📝 Checklist

• I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: 6dc4921

[codecov-commenter]

Codecov Report

Base: 88.60% // Head: 88.58% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (6dc4921) compared to base (8f5bbd2).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35102      +/-   ##
===========================================
- Coverage    88.60%   88.58%   -0.02%     
===========================================
  Files         2140     2140              
  Lines       397273   397292      +19     
===========================================
- Hits        352004   351960      -44     
- Misses       45269    45332      +63     

Impacted Files	Coverage Δ
src/sage/combinat/free_module.py	95.34% <100.00%> (+0.27%)	⬆️
src/sage/groups/affine_gps/euclidean_group.py	88.88% <0.00%> (-11.12%)	⬇️
src/sage/groups/affine_gps/affine_group.py	96.62% <0.00%> (-2.25%)	⬇️
src/sage/modular/local_comp/liftings.py	98.33% <0.00%> (-1.67%)	⬇️
src/sage/combinat/combination.py	93.50% <0.00%> (-1.50%)	⬇️
src/sage/graphs/generators/random.py	91.26% <0.00%> (-1.37%)	⬇️
...e/combinat/cluster_algebra_quiver/mutation_type.py	52.01% <0.00%> (-0.96%)	⬇️
src/sage/coding/channel.py	97.10% <0.00%> (-0.73%)	⬇️
src/sage/modular/modform/numerical.py	94.19% <0.00%> (-0.65%)	⬇️
src/sage/modular/arithgroup/congroup_gamma0.py	94.41% <0.00%> (-0.56%)	⬇️
... and 19 more

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[kwankyu]

LGTM

[mkoeppe]

Thanks!