[ExPlat] Add A/A test in the logged out state

[jaclync]

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We're adding a separate A/A test from https://github.com/woocommerce/woocommerce-ios/issues/7407 in order to confirm there is no bias in the logged out state.

Experiment design ref: TBA

• AB test name: woocommerceios_explat_aa_test_logged_out_202208

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