Add a System Test for the DepolarizedAnalyserTransmission Algorithm

[cailafinn]

Description of work

Summary of work

Add a system test to check the algorithm works consistently across OS' with real data files.

Fixes #37120

Further detail of work

Also adds the associated data files for running the algorithm properly. The code is set to ignore the error in the fit being quite high. This is intentional.

To test:

• Run the algorithm locally using the ./build/systemtest -R DepolarizedAnalyserTransmission script.
  • This should download the testing data automatically, but re-running cmake and building the SystemTestData target manually may be required.
• The algorithm should pass without issues.

This does not require release notes because there are no user-facing changes.

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[jhaigh0]

Can see the test runs fine in the ci job. One very minor readability thing

[jhaigh0]

Would it be easier for the algorithms in the test to use StoreInADS=False and then just assign the results to python variables?
If you want to use the ADS, is it easier to just clear the ADS in the cleanup method, rather than delete each test by name?

[cailafinn]

Would it be easier for the algorithms in the test to use StoreInADS=False and then just assign the results to python variables? If you want to use the ADS, is it easier to just clear the ADS in the cleanup method, rather than delete each test by name?

Ah, thanks for the heads up, that's a better solution. I was hesitant to just clear the ADS so it didn't clear other tests. But thinking about it, I don't think they run on the same instance of the framework.

[jhaigh0]

Looks good to go, the test failure in the CI is unrelated