Simplify QobjEvo creation and time evolution

[albertomercurio]

Checklist

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Description

The blocking pull request have been merged. So we can simplify a bit the code.

[Copilot]

Pull Request Overview

This PR simplifies the time evolution setup in QuantumToolbox.jl by removing deprecated conditional branches and reducing special case handling in operator promotion. Key changes include:

• Removal of the conditional branch for the :sensealg key in both sesolve and mesolve functions.
• Simplification of the operator promotion logic in quantum_object_evo by eliminating redundant special cases.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/time_evolution/sesolve.jl	Removed deprecated condition and related TODO comment for handling :sensealg in ODEProblem setup.
src/time_evolution/mesolve.jl	Removed deprecated condition and related TODO comment for handling :sensealg in ODEProblem setup.
src/qobj/quantum_object_evo.jl	Removed special cases for _promote_to_scimloperator with MatrixOperator and ScaledOperator.

Comments suppressed due to low confidence (3)

src/time_evolution/sesolve.jl:78

• Since the branch for handling :sensealg was removed, consider deleting the corresponding TODO comment to keep the code clean.

# TODO: Remove this when https://github.com/SciML/SciMLSensitivity.jl/issues/1181 is fixed

src/time_evolution/mesolve.jl:99

• Similarly, the TODO comment in mesolve.jl addressing the :sensealg condition is now obsolete and can be removed for clarity.

# TODO: Remove this when https://github.com/SciML/SciMLSensitivity.jl/issues/1181 is fixed

src/qobj/quantum_object_evo.jl:443

• Ensure that the removal of these specialized promotion functions does not affect expected operator behavior; consider adding tests for AddedOperator promotion to validate the new simplified logic.

function _promote_to_scimloperator(α::Number, data::MatrixOperator)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.16%. Comparing base (a1d1627) to head (e407191).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
+ Coverage   94.08%   94.16%   +0.07%     
==========================================
  Files          49       49              
  Lines        3042     3032      -10     
==========================================
- Hits         2862     2855       -7     
+ Misses        180      177       -3     

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