Add tests/fixes for inplace rules

[kshyatt]

Added more tests to test_pullbacks_match to make sure the state of the arguments is restored, and the final argument derivatives match between inplace and non in place methods.

Unfortunately, the Mooncake FD tester doesn't work well for our functions, because A becomes a scratch space, and the inputs are also the outputs (so get incremented twice under the FD scheme).

[kshyatt]

I'd like to do a bit of tidying up with this one but it can be merged if tests pass and people feel like it, I can just make a separate PR.

[codecov]

Codecov Report

❌ Patch coverage is 5.26316% with 108 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...gebraKitMooncakeExt/MatrixAlgebraKitMooncakeExt.jl	5.26%	108 Missing ⚠️

Files with missing lines	Coverage Δ
...gebraKitMooncakeExt/MatrixAlgebraKitMooncakeExt.jl	16.91% <5.26%> (-82.22%)	⬇️

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