Add advanced targeting criteria to avoid the MR experiments on desktop

[shell1]

Can we write an advanced targeting criteria to avoid MR experiments when they are in the preview mode?

I'd like targeting that can avoid these 2 recipes - for use in the waldo and pocket experiments.

https://experimenter.services.mozilla.com/nimbus/106-major-release-firefox-new-user https://experimenter.services.mozilla.com/nimbus/106-major-release-firefox-existing-user-experience

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