Switch tests to use TestItemRunner.jl

[thofma]

Closes #72.

Minor caveat: In vscode, you cannot rerun the whole test suite. Apparently JET overloads all methods for JET purposes, leaving the whole test "environment" in a bad state (which gets reused once you rerun the tests).

[thofma]

The aforementioned problems are also visible in the JET = true test: https://github.com/QuantumSavory/QuantumSymbolics.jl/actions/runs/10235345985/job/28316061643?pr=75.

Here is what goes wrong: After JET.report_package(...) one has the following:

julia> JET.report_package(QuantumSymbolics);
[...]

julia> @op A; @op B;

julia> QuantumSymbolics.prefactorscalings([2*A B])
(1, Any[2A, B])

julia> 2*A isa SScaled
false

julia> typeof(2*A)
SScaledOperator (alias for Main.var"##JETVirtualModule#227".QuantumSymbolics.SScaled{QuantumInterface.AbstractOperator})

Without JET:

julia> @op A; @op B;

julia> QuantumSymbolics.prefactorscalings([2*A B])
(2, Any[A, B])

julia> 2*A isa SScaled
true

julia> typeof(2*A)
SScaledOperator (alias for SScaled{AbstractOperator})

This type mismatch 2*A isa SScaled == false messes up the prefactorscalings method.

[thofma]

I worked around it by running the JET test last.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.11%. Comparing base (d3226fc) to head (47b8161).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   73.88%   74.11%   +0.23%     
==========================================
  Files          18       18              
  Lines         804      823      +19     
==========================================
+ Hits          594      610      +16     
- Misses        210      213       +3     

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[Krastanov]

Thank you! Added to the list :D