Products Onboarding: Add the banner experiment to the app

[rachelmcr]

Closes: #8002

Description

This PR adds the A/B test for the products onboarding banner, and removes it from behind the feature flag.

The banner will only be visible to eligible users in the A/B test treatment group, and only after the A/B test is started on the backend. (The banner is also visible to eligible a8c users in the treatment group while the test is in staging.)

Changes

• Adds the products onboarding banner experiment.
• Replaces the feature flag check with a check for the A/B test treatment group.
• Adds MockABTesting for unit testing A/B test behavior:
  • setVariation(_:for:) lets us mock an experiment assignment in unit tests by manually setting the provided variation (control or treatment) for the given experiment.
  • This new method is used in our unit tests so we can still check that the products onboarding banner takes precedence when the user is eligible to see it.
• Removes the unit test that was used for checking the banner behavior behind a feature flag.

Testing

Prerequisite (before launching the app)

1. Open the experiment details in Abacus (linked at the top of pbxNRc-26F-p2 or ping me for the direct link).
2. In the Audience section of the experiment setup, go to Variations > Manual Assignment and use the bookmarklet to assign yourself to the treatment group.

Test the treatment behavior

1. Build and run the app. Note: You must be logged in to the app with an a8c account to test the experiment assignment/behavior while the experiment is in staging. If you are logged in to a different account, log out and log in again with your a8c account.
2. Select a store with no products.
3. Confirm you see the products onboarding banner on the My Store dashboard.

Test the control behavior

1. Build and run the app.
2. Log out and log in with a non-a8c test account. (Alternately, use the prerequisite steps to assign yourself to the control group to use your a8c account. While the test is in staging, manually assigning yourself to the control group or logging in with a non-a8c account will show you the control behavior.)
3. Select a store with no products.
4. Confirm you don't see any banner on the My Store dashboard.

Submitter Checklist

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr8003-5440aad on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[Ecarrion]

Looks good!

One thing that happened to me is that I had to log out and log in in order for the variation status to reflect on the app.

I'd assume that only happens because of the staging environment, right?

[rachelmcr]

I'd assume that only happens because of the staging environment, right?

Yeah, it's because of how we change the assigned variation while testing the staged experiment. Normally users will be get a single assignment for the experiment and it won't change, so they won't experience that.

[peril-woocommerce]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 2 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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