Deprecate sage_numerical_backends_coin in favor of cvxpy+cylp, upgrade cbc to 2.10.10

[mkoeppe]

📚 Description

To replace sage_numerical_backends_coin, we need several improvements of the cvxpy+cylp backend:

• CVXPYBackend: Implement remove_constraint[s] methods #35445
• Vectorize the backend: The current approach of 1 scalar cvxpy Variable per backend variable does not scale.

Resolves #30644

📝 Checklist

• The title is concise, informative, and self-explanatory.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

• Depends on CVXPYBackend: Implement method remove_constraint #35369 (CVXPYBackend: Implement remove_constraint[s] methods #35445)

[mantepse]

I'm not sure whether I am a good reviewer for that - I have no idea what I should actually check.

[mkoeppe]

It's waiting for the dependency #35369 anyway

[mkoeppe]

Next steps:

• Collect examples from doctests in sage.graphs or sage.combinat that take nontrivial time with GLPK
• Test with the backend; should typically be faster; if not, check for performance losses in interfacing

[github-actions]

Documentation preview for this PR (built with commit 96651d2) is ready! 🎉