Skip BayesQuasiTest on macOS

[cailafinn]

Description of work

Summary of work

Failing due to fitting differences (probably). Skipping as there are no known macOS users for this algorithm. Should still be fixed to allow consistency, this is a temp fix only.

Purpose of work

Allow the nightly build to pass.

To test:

On Windows & Linux:

1. Run the test using the systemtest script in the build directory.
2. The test passes.

On macOS:

1. Attempt to run the test using the systemtest script.
2. The test is skipped.

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

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[sf1919]

Does this need to be on release-next?

[robertapplin]

Thanks for adding this skip. I'm not aware that Bayes Quasi is used on Mac, so we should be good to investigate this later

[RichardWaiteSTFC]

Happy to merge this - does it need a MacOS tester or should we just see if the nightly builds on OSX?

[robertapplin]

Happy to merge this - does it need a MacOS tester or should we just see if the nightly builds on OSX?

I believe it shouldn't need a MacOS tester because the MantidSystemTest framework handles the skipping