Deprecate is_Cone, is_LatticePolytope, is_Polyhedron, change uses to isinstance

[vamshipy]

Depricated 3 functions is_Polyhedron, is_Cone and is_LatticePolytope and replaced using the python function "isinstance"

Fixes #34307

📝 Checklist

• [x ] The title is concise, informative, and self-explanatory.
• [x ] 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

The change seems simple so i don't know if there are any dependencies involved

Tried to change the comments(explanation) in the code don't know it counts as documentation
Would appreciate any kind of feedback from anyone

[mkoeppe]

Thanks for working on this.

Note though that "deprecating" means to keep the function definitions but issue a warning whenever they are used. https://doc.sagemath.org/html/en/reference/misc/sage/misc/superseded.html

Deleting the function definitions needs to come in a second step, not earlier than a year after we have issued the deprecation warnings.

[github-actions]

Documentation preview for this PR (built with commit 9defda5; changes) is ready! 🎉

[vamshipy]

Thanks for working on this.

Note though that "deprecating" means to keep the function definitions but issue a warning whenever they are used. https://doc.sagemath.org/html/en/reference/misc/sage/misc/superseded.html

Deleting the function definitions needs to come in a second step, not earlier than a year after we have issued the deprecation warnings.

Thank you for your feedback, I will keep working on this and ask for a review

[vamshipy]

will create a fresh pr