Onboarding intro lock user interface to portrait for iPhone

[alessandroboron]

Task/Issue URL: https://app.asana.com/0/1206329551987282/1207723831937948/f

Description:

This PR locks the user interface to portrait for iPhone. For iPad, we still allow landscape user interface because it’s what the users expect.

Steps to test this PR:

Scenario 1 - iPhone

1. Launch the App and show the onboarding flow.
2. Rotate the device/simulator to landscape Expected Result: The user interface should not rotate to landscape.

Scenario 2 - iPad

1. Launch the App and show the onboarding flow.
2. Rotate the device/simulator to landscape Expected Result: The user interface should rotate to landscape.

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

[github-actions[bot]]

:no_entry_sign: The Asana task linked in the PR description is not added to iOS App Board project.

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