Onboarding Add To Dock Pixels

[alessandroboron]

Task/Issue URL: https://app.asana.com/0/72649045549333/1208590665790272/f

Description:

Add pixels for "Add To Dock" experiment.

Steps to test this PR:
Prerequisites:

1. Ensure that isOnboardingHighlightsEnabled returns true in OnboardingManager.
2. Add return VariantIOS(name: "mx", weight: 1, isIncluded: VariantIOS.When.always, features: [.newOnboardingIntroHighlights, .contextualDaxDialogs]) in DefaultVariantManager -> selectVariant() at line 156.

Scenario 1 - Add to Dock is presented from linear onboarding

1. Ensure that addToDockEnabledState returns .intro in OnboardingManager.
2. Launch the App.
3. Wait for the Add to Dock Promo screen is presented.
4. Ensure that “m_onboarding_add_to_dock_promo_impressions_unique” is fired.
5. Tap “Skip” button and ensure that “m_onboarding_add_to_dock_promo_dismiss_button_tapped” is fired.

Repeat the test and when Add to Dock Promo screen is presented:

1. Tap the “Show me how” button and ensure that “m_onboarding_add_to_dock_promo_show_tutorial_button_tapped” is fired.
2. Tap the “Got It” button and ensure that “m_onboarding_add_to_dock_tutorial_dismiss_button_tapped” is fired.

Scenario 2 - Add to Dock is presented from contextual onboarding

1. Ensure that addToDockEnabledState returns .contextual in OnboardingManager.
2. Launch the App.
3. Complete the contextual onboarding till the end of journey dialog.
4. Ensure that “m_onboarding_add_to_dock_promo_impressions_unique” is fired.
5. Tap the “Start Browsing” button and ensure that “m_onboarding_add_to_dock_promo_dismiss_button_tapped” is fired.

Repeat the test and when Add to Dock Promo contextual dialog is presented:

1. Tap the “Show me how” button and ensure that “m_onboarding_add_to_dock_promo_show_tutorial_button_tapped” is fired.
2. Tap the “Start Browsing” button and ensure that “m_onboarding_add_to_dock_tutorial_dismiss_button_tapped” is fired.

Repeat the test and instead of showing the End of journey dialog from NTP, show it from contextual dialog.

Definition of Done (Internal Only):

• Does this PR satisfy our Definition of Done?

Copy Testing:

• Use of correct apostrophes in new copy, ie ’ rather than ’

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 15
• iOS 16
• iOS 17

Theme Testing:

• Light theme
• Dark theme

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Internal references:

Software Engineering Expectations
Technical Design Template